Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde23793912c17cf…

MALICIOUS

PDF

126.8 KB Created: 2021-03-21 05:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9531a2202d61302086f45a99cd4479ed SHA-1: b7fc776bbbbfe97f9977fde059c497d4b978e699 SHA-256: cde23793912c17cff12801a7f8ee36bda49c2b5cafa48d29b40a83a78cb6879e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The primary URL, 'https://baarspo.ru/strik?utm_term=merchant+of+venice+workbook+pdf+download', suggests a lure related to downloading a workbook, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=merchant+of+venice+workbook+pdf+download PDF link annotation
    • https://zagamujibagixon.weebly.com/uploads/1/3/5/3/135326067/dowodof_vevixanita_puwawuloroje_kumomokukigozi.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/vuzekum.pdfIn PDF document text
    • https://wewokidopubix.weebly.com/uploads/1/3/0/8/130873978/a7985308742a10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fd2df1a1c839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_6024321ea58ea.pdfIn PDF document text
    • https://gaturipagi.weebly.com/uploads/1/3/0/7/130739573/ganovogipi.pdfIn PDF document text
    • https://filudatobo.weebly.com/uploads/1/3/2/6/132681654/rofubibu_pakusi_nunum_gedodub.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/lifaz-nodutagagi.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/0eR6hgf/lake_louise_snow_report_weather_network.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/gfhrghc/wisofupejapelik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_604d367ae3ef8.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/ggjclgh/kemapisiso.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/ZAZhjfs/takubemavatevivipegujolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fc61b706108a.pdfIn PDF document text
    • https://katinena.weebly.com/uploads/1/3/1/3/131383377/nasubezeki-pabijotazexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_600e2f6065172.pdfIn PDF document text
    • https://fazulozuxili.weebly.com/uploads/1/3/4/6/134625369/tibazuj_toromeja_nuzoxesasolelo_xezeduga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb3f1ec-18b5-479c-936d-88c8fce86dc5/hp_8620_printer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ff6e5c-e8eb-4283-9bb0-ef060f3da654/zoruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b11a1b9-f54a-4530-83db-28a1e9fe0c25/alpha_dog_define.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcd1a56-2b9c-4f1c-815d-a01f35c54a49/machine_learning_matlab_tutorial.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_c905fe6f16b14c2f97c776dfd4bf9391.pdf?index=trueIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_72af68cc06e5441eaaa691f506b2b77d.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_cfe20e88b2bc4479ac45919ee71f1c1f.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_f0b0ce5f053546c58182ee94118c8ddf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19073 5428 bytes
SHA-256: 7452c8a7b62a4c0ab1091a37df8bfe86bca9204a7ce898603bc9f06921cc6b16
font_01_sfnt_off0001a301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A301 15252 bytes
SHA-256: 40ee2e0b5689171b9857e10e1c76bef7af282b5bca966ff3c9666dd91dddede5
font_02_sfnt_off0001d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D21F 17680 bytes
SHA-256: 4070d43cb2b2fec8482b9f69ced7c9236075ddbb4f3ef0935026edfbda86c945