Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7c60239c2ec90e…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 00:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4bd21b1e79b1f2bb6c0689ebe76d11b SHA-1: 2e5451be25a61f36d7375e0c67138028295a56d3 SHA-256: 1c7c60239c2ec90e110727c4f4edbe7ad51b54057de32cb65639a78eb88a9703
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 5

  • 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://dugedepap.ru/strik?utm_term=5e+unearthed+arcana+weapon+feats PDF link annotation
    • http://rankingcoach-seo.com/vevilakodiluwo4zb1m.pdfIn PDF document text
    • http://fesabip.iblogger.org/human_and_material_resources.pdfIn PDF document text
    • http://on-arenas.com/pefagijoxmbw0f.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/67698407856.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/zefutajikuvepipi.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/2147834.pdfIn PDF document text
    • http://kupiokno.su/fathers_and_sons_volvo60odd.pdfIn PDF document text
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/fe9ef27a096d7d.pdfIn PDF document text
    • https://definifizuzum.weebly.com/uploads/1/3/4/7/134759181/2741440.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/mumuputeta_wararo.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/nukuzijedivozewe.pdfIn PDF document text
    • http://deteluwo.iblogger.org/mutigarewosivow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilixafex.epizy.com/android_authority_samsung_s9_giveaway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5cf28c-5e0c-47ce-9b8c-e7f520a0bc4f/77101331227.pdfIn PDF document text
    • http://mevedokepovi.epizy.com/bandeya_re_bandeya_arijit_singh_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63a7e2b-7fe8-43b4-8a35-6987413a2efc/87433438224.pdfIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/basic_guitar_chords_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9ad3a4-3c82-452e-ac9e-110fdddbb460/pathfinder_npc_codex_free.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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 5332 bytes
SHA-256: c952e016a12ce198efdcade4bf2ae3ef8c53167c02346aa5c5033666ce3eaefd
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10624 bytes
SHA-256: 48dba893952965e360645c37e43bde2221174da7929a77f2814e24eea4340d33

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