Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafe764b4bdd17d4…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 20:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2647759dc43d03dcae2cd485293dcda2 SHA-1: 5628723a062ea37cb24c3d1720fa6716f84f6e23 SHA-256: fafe764b4bdd17d42d66fc0aa3ec2b2dd34a99a3394b3de2f87561a19b2d8707
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or spam document. The PDF contains a large number of external links, many of which are dynamically generated or use numeric slugs, suggesting an SEO link farm or a phishing campaign. The embedded URLs point to various domains, including zajinet.ru and cdn.sqhk.co, which are likely used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=leapfrog+letter+factory+dvd
    • https://cdn.sqhk.co/padirazemi/ejeiges/41788722243.pdf
    • http://store50off.info/clasificacion_cuatripartita_del_derecho_romanorirpg.pdf
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fed91de18bed.pdf
    • https://cdn-cms.f-static.net/uploads/4460983/normal_6023d08d8ba48.pdf
    • https://cdn.sqhk.co/wuzededoz/tLvZ0if/road_riot_hack_mod_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4408177/normal_5fcd20fb72ec3.pdf
    • http://5euro.info/code_formatting_shortcut_in_atomgggt5.pdf
    • http://osmosiotzs.fun/woxamulaxozulewoxurij4h6wy.pdf
    • http://forpost-electrica.ru/71209587270sj0rp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_fd0a04eebc224347a925262dc60c136f.pdf?index=true
    • https://s3.amazonaws.com/rumezo/15839948099.pdf
    • https://s3.amazonaws.com/jarirotexab/90075018734.pdf
    • https://s3.amazonaws.com/mikibetiv/symmetry_art_worksheets.pdf
    • https://s3.amazonaws.com/bezegoluzose/82392835126.pdf
    • https://uploads.strikinglycdn.com/files/57cf3a66-bdfc-49f6-b290-3cc4ae4c40ae/charlie_and_choc_factory_characters.pdf
    • https://uploads.strikinglycdn.com/files/ffe701ad-72f1-44ca-9804-5f19ecc00cc1/netgear_jgs524na_manual.pdf
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_dfd45295cd954d2ba2f98efc40913c6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53b33536-a10f-464c-88df-784be172c971/79519586554.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_4bd03fbefcb94133b38afa1eea41ce93.pdf?index=true
    • https://s3.amazonaws.com/murudute/44491340244.pdf
    • https://uploads.strikinglycdn.com/files/bbec3b2f-b5f5-4e1d-89a1-5f2c9987fb81/kafepofiloruvinatinolupuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d427.bin
0ccd479a50cd5b95d23b6449c2fdcabeca2b12f52289a9efe4737c1ad1051df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 4884 bytes
font_01_sfnt_off0000e4e9.bin
0740b967b459cbb55db2e7eb8a103c71b9d0442979c5eeab1e8d91209f131757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 11052 bytes
font_02_sfnt_off00010a7e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 4324 bytes

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