Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c44b29f6a95ce2f…

MALICIOUS

PDF

71.1 KB Created: 2021-03-21 11:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d989d3b57a1fb365b407bda352cd0da SHA-1: 6909596b5aaeebeff8c65abafe3f957f76129de3 SHA-256: 4c44b29f6a95ce2f03990173cdd1e573860e6f0870de0dd57a1776c5c3fa4dd3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm on disposable hosting, aiming to obscure the true malicious destination. The embedded URL and the document body, though heavily obfuscated, point towards a lure for downloading further content, likely a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=logitech+ergonomic+keyboard+manual PDF link annotation
    • https://cdn.sqhk.co/zezetemirag/Mnhg9xl/bingo_dvd_tv_game.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/tugipojuxis.pdfIn PDF document text
    • http://wukilirukorobow.iblogger.org/6th_grade_science_vocabulary_words_and_definitions.pdfIn PDF document text
    • http://nuzimes.iblogger.org/tinjauan_pustaka_alelopati.pdfIn PDF document text
    • http://rikuximuvo.iblogger.org/26581191184.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/G0jchhb/kibiz.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/sejevalumemopi.pdfIn PDF document text
    • https://ratexema.weebly.com/uploads/1/3/4/7/134720574/kutawaf-lepakeme-taxuzavojodire.pdfIn PDF document text
    • https://lixobezabutefa.weebly.com/uploads/1/3/1/4/131406736/vorivarezuvutenu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/duSidcC/narixapus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_60236fe3e2f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_6025d065f1fbe.pdfIn PDF document text
    • https://jugujepatuw.weebly.com/uploads/1/3/4/9/134900825/0c2de.pdfIn PDF document text
    • http://buzovanukoziba.22web.org/depabazopelefajuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5fffb7b1f0228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473044/normal_5fcf21b80382f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotopokidag.epizy.com/remul.pdfIn PDF document text
    • http://zikefibuji.rf.gd/astm_e83_16.pdfIn PDF document text
    • http://susesibukof.epizy.com/capital_gains_tax_guide_2016.pdfIn PDF document text
    • http://pewesinelukaveb.epizy.com/japepunozij.pdfIn PDF document text
    • http://josetevuj.epizy.com/gixevarinat.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/ruluka.pdfIn PDF document text
    • http://supisaminuwon.rf.gd/washington_state_mens_basketball_coaching_staff.pdfIn PDF document text
    • http://xinovedef.rf.gd/cdate_in_vb._net_to_format_date.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 5420 bytes
SHA-256: 638ffb3528a2d92d6add4fb50bc4e292df3e27c3d316fff658851e14c9c34be5
font_01_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10728 bytes
SHA-256: 29b5262359a9242ce5dc78c692558a054fb682ed79d7c8028697847fd6ec26a3