Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2f864300c9a28e…

MALICIOUS

PDF

91.8 KB Created: 2021-03-25 15:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cf2839d8bdf06d51b3cf81dfb44f09aa SHA-1: 9354c8ced965c0472406cafdae3011410b15a57c SHA-256: 8a2f864300c9a28e953337f523abd27160927130a523ff5d7a88221df58a6a82
186 Risk Score

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 0.9990

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://golowaki.ru/wix?keyword=because+of+low+abbi+glines+pdf PDF link annotation
    • https://cdn.sqhk.co/zamokaxu/dbNgchc/18769369639.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/2jlCjdl/fozarofosike.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/gijblGO/22566100788.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/45193262783.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/ViiBgjA/madagulogajepugunos.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/ijjdjcU/best_2_player_board_games_2020_bgg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_09e86b73a09a48e294aa705dc7e16eca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/20509848661.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/1915665143.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_b8e8d34bf33144249e08109345a566f5.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_1d29b6ce426c4e25a3c42059b279d6a5.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_916123b645814e6c81d7affb56912674.pdf?index=trueIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_183c47efd5b340b09838e1f75b6a6f0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/28841193145.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_39e22842095740d09c99c4838d85069d.pdf?index=trueIn PDF document text
    • http://kijonag.onlinewebshop.net/92978000610.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_c4ffb94e672c457b90db7339ed636a2b.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_e89a491ff5c94f74b316c845f08989ed.pdf?index=trueIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_31cc4bff3af6403eacce6be552ea506a.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_6ba377d748c14641a694b0cded5d3cdc.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_642b1ea34ce440ff858ed38b9b4c12d1.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_74890d8b74c04cb296a0e3999f4f88f3.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_37401eebd4654f7bbfa6e3a07bf8b5ce.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 5312 bytes
SHA-256: 1cb322e318ca3bc3a6708b5d0d1091d17708879258cd10fbfef4f3d1ab04eca3
font_01_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 12628 bytes
SHA-256: 6655abe8cf8a24b6d1b7fe76cd8f25055fd95f11bac28416a6a8e573b482fcf4
font_02_sfnt_off000153c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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