Malicious PDF — malware analysis report

Static analysis result for SHA-256 949c7310f553059a…

MALICIOUS

PDF

92.7 KB Created: 2021-03-19 07:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 506fcb658433a70dadf230b40f48178c SHA-1: 5c389c012d1a4dbd15fc187eb5b7cb098b072f0e SHA-256: 949c7310f553059a476dfec01eb12a861aaa4cb2d732e4bbc8a56be21495a9b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of external links, with one specifically pointing to 'zajinet.ru/award', suggesting a link farm or redirection to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to 'marketing management textbook pdf'. No scripts were extracted, but the PDF structure and numerous external links strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=marketing+management+textbook+pdf
    • https://cdn-cms.f-static.net/uploads/4489593/normal_602f75d109987.pdf
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5ff63a8eee385.pdf
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fceda07f3aed.pdf
    • https://kijapipova.weebly.com/uploads/1/3/1/4/131407887/57e793305a9e7.pdf
    • https://cdn.sqhk.co/bevoletef/UhcmZ6C/measure_with_love_kitchen_art.pdf
    • https://cdn.sqhk.co/xogeloke/hdPZ8hf/nuvefokomenoxubi.pdf
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/jolosazigig_keralenus_dinumeposeb_rasidi.pdf
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/zalaxufus.pdf
    • http://mekapetakosa.22web.org/apocrifos_del_antiguo_testamento_tomo_1.pdf
    • http://jawomubinuj.iblogger.org/wurew.pdf
    • https://cdn-cms.f-static.net/uploads/4424951/normal_602b8dc7d8df7.pdf
    • https://cdn.sqhk.co/tedigedubemi/fJ11FTv/suzuratudovasug.pdf
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601e273aa1c67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dewazewokib/52027334870.pdf
    • https://s3.amazonaws.com/kigavanus/90490965640.pdf
    • https://s3.amazonaws.com/patotale/referral_letter_template_for_employee.pdf
    • http://kekogixo.epizy.com/what_does_it_mean_when_smoke_alarm_blinks_green.pdf
    • http://zekubegem.epizy.com/vabosexokivijasur.pdf
    • https://s3.amazonaws.com/bagisi/69211862813.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/telugu_short_stories_written_in_english.pdf
    • http://defipezisezujor.rf.gd/nccn_guidelines_multiple_myeloma_2019.pdf
    • https://s3.amazonaws.com/wovugi/c-_section_video_step_by_step.pdf
    • https://s3.amazonaws.com/legobegutulo/xavezenefofetix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001253b.bin
b5c01ce5bdbca55cc6822d071164c10b24e976df3b185e825129c0a0425553f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 5428 bytes
font_01_sfnt_off000137b3.bin
8ac5b620c53d48f99344b1d7bb48f2bba84cd5ea369d8019e8ff030a09018e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 15732 bytes

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