Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c39fd5f99c6d58…

MALICIOUS

PDF

81.7 KB Created: 2021-03-30 08:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f401ec60e2c6b5a5e5857cd6f21be16b SHA-1: bfefd5ad8288155ab77f28417c867b18e1390867 SHA-256: 31c39fd5f99c6d58c68216bcc6973b08ae413cbda71168e12978f3ac39e73a90
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, consistent with a link farm or SEO spamming operation. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://seumenha.ru/award?keyword=broiler+chicken+feed+formulation+pdf PDF link annotation
    • http://jisuvakuwiraza.medianewsonline.com/64346823770.pdfIn PDF document text
    • http://bravos-kids.ru/kawisenoxuxasuwz40l0.pdfIn PDF document text
    • https://kesakoti.weebly.com/uploads/1/3/1/0/131070149/laxezipap.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/sovikeweluge.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/6626877.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/miwiledanuna.pdfIn PDF document text
    • https://dagarodidosuva.weebly.com/uploads/1/3/2/6/132696056/0176ef34255939a.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/22c3f710a6f.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/44168914454.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/fourth_definition_of_myocardial_infarction.pdfIn PDF document text
    • http://zoomita.space/guzexavazareruxti90.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/piviku_salivanabeku_wilolemetog_pugim.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/wusedodoruxif.pdfIn PDF document text
    • https://tenefaguvij.weebly.com/uploads/1/3/4/2/134235535/4314732.pdfIn PDF document text
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/10425d4163c77.pdfIn PDF document text
    • http://salleop.xyz/soporotezixad5bp8v.pdfIn PDF document text
    • https://xugowapowafav.weebly.com/uploads/1/3/0/7/130775127/zunaweleluz-nikukegimif-vebirilono.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/wilerolevawipivuxulaguz.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/runewum.pdfIn PDF document text
    • http://gramnews.xyz/21629142548zm7cw.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/biwaxofowugavasolu.pdfIn PDF document text
    • http://bluebadgeapproval.com/dd_5e_player_reference_sheetjwd4u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_a511854b951e4aecba62a50f18a97635.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_c6c222476cae42ceb839c70424e18b21.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_a20af7882b614c12b536d26d4e9f6316.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_0cc565140d374448a1a4a955d68e526c.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 5212 bytes
SHA-256: e32008d8c094d103987e0bd9861fa85cee380e491a716f33842531f58d680897
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 10820 bytes
SHA-256: 7287f18e58792297d7a3bc54b6b8fc9a1af60090de6c306dc2a84bb963499fcf
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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