Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe92badb941b8baa…

MALICIOUS

PDF

105.7 KB Created: 2021-04-03 04:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b31149f899a110faa85001e8d2683186 SHA-1: a42a5f5275aae4e46831a29c6e41a27e192ba652 SHA-256: fe92badb941b8baabdc07c80629ac23eb3cc8945ccd9b63dbb71117352facb2f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'ML_NYX_PDF_MALICIOUS' along with ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the sheer volume of outbound links suggests an attempt to lure users to potentially compromised or malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/award?keyword=cerita+ashabul+kahfi+pdf PDF link annotation
    • https://jubukukovojiri.weebly.com/uploads/1/3/5/3/135306868/kajurupipitop_matevimojiduga_kolijotateweve_tukanegiwuja.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/viloxefaj.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/9eb80a20.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/voxolozebiz.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/sotodubum.pdfIn PDF document text
    • https://dasukixarukawo.weebly.com/uploads/1/3/2/8/132814138/a6baece72.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/200_profitable_business_ideas_in_kenya.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/posujamigapil.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/xapunebel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/313089719.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/56057555826.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_a13e56d1b5e241c3a6b464419aed428f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76806044-a3f6-4103-831a-26bf2db887b8/dikutejupixutebof.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_ee79b043f4bd4957b271ab1a742914d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/caselet_di_ibps_po.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_d26c9ad7fcae44f292aac79fc4c1106a.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_98f1b7bd7e2e4745a9dbe27ed965abaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b0bdc6-4fb8-47a2-8fdb-93bb95f82085/57613041228.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_444fe0f8a410449b9d9363b71010e333.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_f2e1746f4ce147a3bd30c6fd70bec211.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/12661125612.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_bff4c722aa9443fca2bc5def515da63a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/862a5757-c6c7-4b61-80ba-f35d86f10708/melelukegu.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/zidaxozefitejinos.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/86546545444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18349fa-0eca-4eec-9631-718840015c33/kanger_top_evod_e-cigarette_starter_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a36ed5-c4d2-4836-be66-a683846b02e6/7776680425.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000164e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x164E0 29216 bytes
SHA-256: 1745bf9b6df17e5abb9598ee46529124995c18ed41cbe7e55dad7295cf958413
font_00_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 5236 bytes
SHA-256: 289c2adb898d1b458c2bb7f851fece48190c50c67a3d2a69aecc60319f51795c
font_01_sfnt_off00013f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F95 11164 bytes
SHA-256: ca2af0442ee32bc8a2c895542048108c1359fee43a30c1e7934b8dff0af1ccd1

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