Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2eb9b205400a498…

MALICIOUS

PDF

113.7 KB Created: 2021-03-16 09:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4ac103426dce61b6ad3080ba89e07881 SHA-1: a45856d582061e74b25cbb9d1bd65f71c7710ae1 SHA-256: c2eb9b205400a4987e59a68c064dc6cf8d6a42a757a1135bb940c9185a040d44
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV heuristic also strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://pelibifir.ru/wix?keyword=master+slave+jk+flip+flop+characteristic+table PDF link annotation
    • https://cdn.sqhk.co/fodibaniwe/a5Xidgf/free_slot_games_online_no_download_or_registration.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/ifNGhgc/anime_live_wallpaper_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/YPoicjj/14115646817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fe808100f039.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/UYja2Ep/nenexijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_604c9d3578e27.pdfIn PDF document text
    • http://pokanupat.iblogger.org/10226523253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5ff9a69c7cf59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_f88f0958e5af45d2b1af18518c19f455.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_74b54664dd0f4c86a9de1a7c48ce5a9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/bomba_de_engranajes_hidraulica.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_14ac96e3dba5461dbcc63c96750345f2.pdf?index=trueIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_48e69369e3384c21863470fb4585be34.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_79246dd090aa4f2abd2170f9e835f1ea.pdf?index=trueIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_169da984801947bb942ab9acb00f5dc2.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_98f5cb31f6fd44618b053fb1768a611e.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_c49aa781011e481d82ea1629260db1bc.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_7e88346ba2084568b63e985c540763ec.pdf?index=trueIn PDF document text
    • http://lojupodinitaxug.epizy.com/universal_audio_arrow_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/calabrio_one_user_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16648 5448 bytes
SHA-256: 39d9d3c0ecba49a6598c1c97500eacfbacf8da79cf00d18b277a65a7f1cd1902
font_01_sfnt_off000178e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E3 11984 bytes
SHA-256: 32eeb087fdefad56e2166a40505e6d8be8e15706ac52cc4c7840a56bdec9a4f2
font_02_sfnt_off0001a1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1BF 16300 bytes
SHA-256: c42f691e5cc3b77571970377fec6a88e8dcedd5dc844c29f13f450a6730d4e0a