Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dff957179343db3…

MALICIOUS

PDF

77.5 KB Created: 2021-02-17 09:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c35788441e180968f0a81975e7ed7885 SHA-1: 85cf0044d2b3cd78dd350002084244353d74bd2b SHA-256: 2dff957179343db3a4e196dcaa4baae5c7372fdee365ad8d1ab6ace4fc2cc32a
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a large number of external links, suggesting it is part of a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, contains references to 'electrical engineering major average salary' and 'wkhtmltopdf', likely as lures to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/strik?utm_term=electrical+engineering+major+average+salary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458150/normal_6003912df05ff.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/9396698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fc8760a91344.pdfIn macro / runtime command snippet
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/2918422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd6524e86892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fe2bf8c584d7.pdfIn PDF document text
    • http://dorightschool.com/rusibazewigls39v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_60121b6567c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_5fdcb6909c5ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_602180cfeeca9.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/php_html_list_to_array.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/7869407.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/naseli_titomoku_kafef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_601b4038a8369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5fe697b263b14.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/3464693.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/13In macro / runtime command snippet
    • 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
    • http://nunevubedodunu.rf.gd/incline_dumbbell_curl_form.pdfIn PDF document text
    • http://wemiwapava.epizy.com/blind_date_1987_movie.pdfIn 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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 5104 bytes
SHA-256: 1152444ed33d83b0020daeae8ae3e179b737a42f1f8a97d59ca821f187528094
font_01_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10744 bytes
SHA-256: 93e71b3ed4edac4765f26f58de299de7e03edae17d329296aee5d6da10b35a23
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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