Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e1343c47906ff3…

MALICIOUS

PDF

76.4 KB Created: 2021-04-24 11:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4bf1fbc7bf24692a8b38532f837a0c96 SHA-1: 56c58f488ca3344f0fa28d0538ec2f55e0b6e0d8 SHA-256: 81e1343c47906ff3490213c8f33fa730e71e42a0d8a9b18f91a0f4c680f9c05a
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 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 0.9991

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://golowaki.ru/strik?utm_term=corian+countertop+manufacturers+near+me PDF link annotation
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/pawaxavuru_rowidepivegexo_patapiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6015ae284dd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fda627128086.pdfIn PDF document text
    • https://tavoledunu.weebly.com/uploads/1/3/4/7/134708600/3494441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_6017f80d6790d.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/0a1bc50eeffd47.pdfIn PDF document text
    • http://bugesawuterodam.iblogger.org/pagakixor.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/LXig6ue/english_stories_for_students_with_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/gghjghi/i_didn_t_get_any_missed_calls.pdfIn PDF document text
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/puwuxozatilapigu.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/qjhijW4/las_vegas_baseball_tournaments_september_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/Y9OUihZ/4986830226.pdfIn PDF document text
    • https://cdn.sqhk.co/fukaxaxod/lgg9him/puzzle_bobble_4_rom_download.pdfIn PDF document text
    • https://xufaxasevejanog.weebly.com/uploads/1/3/4/8/134886042/biminizudovoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepejifilafimif.rf.gd/92399174687.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/nuzixorawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915f478b-198b-42e3-8626-aaf1c0ff39f4/40956193308.pdfIn PDF document text
    • http://dajovufozimok.epizy.com/paxeviwaxovimutat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2d9487-7e82-45e7-a810-1ff88ecb620d/unwind_book_2_summary.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/90518128893.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/miwotewifabewupaxowufide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eac7f24-68f7-4b1a-866f-db44fc6d1730/count_of_monte_cristo_movie_castle_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10357848-a268-488e-8cb4-2f0912add28c/ise_pro_333_garbage_disposal_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4177ca-5233-4320-bee4-9340dc9007c7/bizoj.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_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 5036 bytes
SHA-256: d63b501ef55461a2081dc35ccc7475877b72a9f6b0f301ca1ad9861f006aa7dc
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 10752 bytes
SHA-256: 7de927f6dbb662ac8a748036703d33fcc3abb10200daaf97a8bebc7123dc1130

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