Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b8ef9a7a2ea2c1…

MALICIOUS

PDF

74.5 KB Created: 2021-02-07 10:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8eeaa819ec3c47231e41f97c64ccca01 SHA-1: 10662ed83a21f136e8fe60b3d26505db7d225190 SHA-256: 09b8ef9a7a2ea2c1ea4b95fd77e0502c8633f27bdb886c3a035e87e88545c577
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like s123-cdn-static.com and weebly.com. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://druttle.ru/123?utm_term=what+is+the+difference+between+mrna+trna+and+rrna PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5ff714e90056c.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/iahchig/alexander_dawn_of_an_empire_similar_games.pdfIn PDF document text
    • http://igclienteam.com/c3_and_c4_plants_examplesnb1b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc6c67e111f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377098/normal_5feefcd6edc81.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/4724581.pdfIn PDF document text
    • http://canonsburglake.org/kefatekemoxitesupopcvf0.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/4TghRnm/jefelenisepekexerim.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/pozamoruxejezo.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/9giKPij/73224620949.pdfIn PDF document text
    • http://busforpay.online/dinuxobipukelosavavuluozylu.pdfIn PDF document text
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/3257946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473035/normal_5fff06e749f91.pdfIn PDF document text
    • https://cdn.sqhk.co/murofoli/vWjfOie/pudifinozufe.pdfIn PDF document text
    • https://tetuxexe.weebly.com/uploads/1/3/1/8/131871535/bagotiguradiga.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/ffyQjdg/94724426628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/envelope_template_ms_word.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/zupotegupifimimurugusomog.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/driving_school_near_me_manual.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5476 bytes
SHA-256: 413a012256a819869e78ca14c6d92a8a89043513b07ec5305c82c65b7d563d54
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 10664 bytes
SHA-256: 42970a2abe923962afcbce9a1409ca933a5cfae3583d97591173e64670345867

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