Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec4f920be9bdce4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 06:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 25e9fb726ded3f428a67e5e955dea528 SHA-1: 8362de286294004466b5bc8559eae62d393c7781 SHA-256: 0ec4f920be9bdce4de43e9c021111a5ed2b8678f10858826a4178d21a3787814
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm. One critical heuristic indicates that a PDF link points to known malicious redirector infrastructure. The ML classifier strongly suggests maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=little+red+riding+hood+costume+adults+asda In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5ffc9ca4968da.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/cUJMIDI/vepasutusi.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/3jeidtr/voodoo_games_tenkyu.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/ijhjiQB/coin_counter_calculator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5fee844048c84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468827/normal_5ff95afd5b0ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d552b009-91cf-4952-9c89-480b2bad4488/why_is_my_samsung_j7_not_connecting_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/bsc_agriculture_all_subject.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d539b4d9e21b4e2a9aba8d4fd294a627.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/926d0201-180b-4c4c-904e-ade96e302e2e/suxozokexuzif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05dd9004-5a27-4281-9048-7658709a456b/tissot_t_race_touch_instructions.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_7886e7f3c2a14be6b6bb6df198e3588c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/sofeferowu.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/nalikexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3b6083-1f8e-4654-99e9-b18a9e1eb992/how_difficult_is_it_to_replace_floor_joists.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_88af69fbb19540d095fe26853d049f5f.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_5de7e87d29e5403da68ff1a0e568025d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c86aab-b374-4e87-bcfa-648e7bac723b/16125922100.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/alexina_silent_killer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185a8404-daa4-43b6-b651-27c077b3f179/38654132956.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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 5292 bytes
SHA-256: 7a86d10e28071351544d2ff85ca149a50cbb4f08f07a8e0355e6b8971dcdccc1
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 11496 bytes
SHA-256: 24a6701e0ebbd0f8fa1140cfff6fc145bc61a0e3be5232ab86f3ea74e236bc59