Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4349a8cf09325f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-09 12:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e8735d0aa11887ee5790f82c31ae9a40 SHA-1: a1583f7835bba04c98b2159e96f9e7e9ad6698d7 SHA-256: ad4349a8cf09325fa44a7a59286ff4141ebd9734c69efd0b7ec72a02b0b4a57d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/award?keyword=brandenburg+v+ohio+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404105/normal_60081ad438e76.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/idyjin2/world_of_darkness_solo_ffxiv.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/87976730948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387806/normal_5ff4f5ec034cd.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/hx2Cuge/socket._io_server_javascript_client.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/jjjdVKi/woodworkers_source_rosewood_club.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6014ccb37ce30.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowaguka/hagg3RH/nail_hit_bone_in_finger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_602fcf7516b40.pdfIn PDF document text
    • http://want-seo.ru/jamazumewinalakokebutedo01av5.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/cdfeddabd61.pdfIn PDF document text
    • http://nodefiw.medianewsonline.com/15956772335.pdfIn PDF document text
    • https://gubanezuwibudo.weebly.com/uploads/1/3/1/6/131606890/jarikosa-sibelop-porekituxejosas.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/pupuzen-bijazisesagoleb.pdfIn PDF document text
    • http://azakalaza3.xyz/ending_inventory_in_balance_sheet713d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_5fd8717540b85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5fc67fe1080ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozogasivufi.myartsonline.com/finuwuxuroki.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_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 5340 bytes
SHA-256: ae7d622092a75474df81618103f5817bc8a34d93376eed759b7f8f74f44c8ca6
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10424 bytes
SHA-256: e96453f4d4baf0618d289f68fdbfc0524221345ed2d2fe97cf8a939a85ba2214

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