Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc883e2069c432ef…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 17:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2323866f3806b75405f45a0a397957fb SHA-1: b856891c8af04259b4969c8a44691824cf8e6665 SHA-256: fc883e2069c432ef06e35cb93145d2b91bbd72d671d44ce954159a4d01d1238e
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://pelibifir.ru/strik?utm_term=adobe+acrobat+pro+2017+serial+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501775/normal_600115ea3cf19.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/XIjeOhg/2_player_racing_games_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tujujelo/jgjdjgb/beep_codes_of_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/icjaXge/bulabiv.pdfIn PDF document text
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/6020097.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/7b5772a26d663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_605c76638d073.pdfIn PDF document text
    • http://tewajaz.iblogger.org/what_is_the_thesis_of_the_essay_once_more_to_the_lake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_6046923d6128f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_605d0fc265c44.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/Wp3nihY/34243200414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_602e751159af3.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/iDJPjik/simple_mode_launcher_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365560/normal_5fe044c0ab40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_603c7867242b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://purevaxa.epizy.com/free_vector_logo_in_corel_draw.pdfIn PDF document text
    • http://tofezigiserix.rf.gd/ccna_bangla_book_free_download.pdfIn PDF document text
    • http://tononuzaribiw.rf.gd/gmail_password_database.pdfIn PDF document text
    • http://depuwuxa.rf.gd/induction_motor_control.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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 5752 bytes
SHA-256: e479b0b436745392e68f88dfd6a964677cc608f87fe8cc49e97506a0ea5c537c
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11564 bytes
SHA-256: 3632d0ee5bb2690a22be37a11bc5bb5dc429cc3f790d997ed36e0e2427f81af0

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