Malicious PDF — malware analysis report

Static analysis result for SHA-256 7406d86688888d1a…

MALICIOUS

PDF

112.7 KB Created: 2021-03-29 22:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b67eb8a8a9b3bd7cb66a6bb40478b67e SHA-1: 1adb3589c163116c57e1a6f9502f29743b82725b SHA-256: 7406d86688888d1a94b1f0ca030ceea42f5f09771dac790dc9c52d9c5ac2f839
156 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 point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to 'difficult airway management guidelines', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=difficult+airway+management+guidelines+2018
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/cb666.pdf
    • http://onkoprofi.ru/40034669227o1mn9.pdf
    • https://kusawagefeduzuj.weebly.com/uploads/1/3/0/8/130874333/xawonokisisibube.pdf
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/2243748.pdf
    • https://cdn-cms.f-static.net/uploads/4470401/normal_60388ac0d0bc3.pdf
    • http://bofinaposo.iblogger.org/financial_accounting_and_reporting_cpa_pass_rate.pdf
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6057b7bfecaba.pdf
    • http://fuviguz.22web.org/free_live_tv_channels_on_mobile_apk.pdf
    • http://antonioit.space/wukanufokuwiwazafayt6lt.pdf
    • http://milesnires.xyz/50146948302byr9s.pdf
    • https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/nuxikolofan_tegavulagidomi_murixazusunejij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fazemiwasagi.epizy.com/dazoketudak.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_996b0a57f7524ab9a0f271620b9df8d7.pdf?index=true
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_510070e2e7874053ababcf543c6f1140.pdf?index=true
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_82f0095d5fa646828989df33318c372c.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/55286754037.pdf
    • https://s3.amazonaws.com/miledu/why_isnt_my_frigidaire_ice_maker_working.pdf
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_6f64c176eee04465b9791348944c629b.pdf?index=true
    • http://tujijekaxevon.rf.gd/sarpino_s_pizza_nutrition_information.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000156a5.bin
c1f066ca1c24afda31f6b4040055366241259709de067759f87d332feb47c6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156A5 5824 bytes
font_01_sfnt_off00016a79.bin
72824ae0933902ff5fae8ea5edcbda9de2b9f0780a52a5ab2a8de4457657024e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A79 11756 bytes
font_02_sfnt_off00019223.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19223 16060 bytes
font_03_sfnt_off0001a6bb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BB 4324 bytes

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