Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1829e63b4b22bb6…

MALICIOUS

PDF

80.3 KB Created: 2021-01-31 22:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1db9f1e70fe6193e04818442fea4449a SHA-1: bb35d7420be40abe36c390d8cdc55302522c09d0 SHA-256: b1829e63b4b22bb67862291c74b0bdbfdf20272a331c917beb1ea110832e2c4c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting or link farms, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host a large number of links, likely for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=seaborn+set+style+fivethirtyeight PDF link annotation
    • http://white-x.fun/skillmill_technogym_manualgxpxm.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/170f3d2604ab92.pdfIn PDF document text
    • http://lnstagramaccounts.com/tumejekobo7pc.pdfIn PDF document text
    • https://poxefapujo.weebly.com/uploads/1/3/5/3/135312596/zewepudov.pdfIn PDF document text
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/modozivuzunipo-ritewuzog-meliruzoxumibel-wewosunabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_6008d3ac03a65.pdfIn PDF document text
    • http://ylyn.ru/elite_dangerous_combat_tipsb6pq8.pdfIn PDF document text
    • http://kokilubowo.22web.org/kels_assessment_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fdfbaa5887ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373778/normal_5feb0a223a5c5.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/2020_catholic_daily_bible_reading_guide5hcx3.pdfIn PDF document text
    • http://biomaniix.website/eggplant_caponata_recipe_ina_gartenxz0at.pdfIn PDF document text
    • http://mjawebdesign.net/blue_bottle_fly_factskspac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381973/normal_5ff7fc4011333.pdfIn PDF document text
    • http://pet-guru.shop/991445556441b2o1.pdfIn PDF document text
    • http://chestlune.online/fundamentals_of_general_organic_and_biological_chemistry_download23bk4.pdfIn PDF document text
    • http://gamedv.design/autodesk_aec_collection_brochureiha8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/suvizazidit.pdfIn PDF document text
    • http://lugirike.epizy.com/interactive_brokers_account_management_user_guide.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/7105300048.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011a83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A83 17052 bytes
SHA-256: 746da5358a4a598f5b46ef383437b78209c4d20f209588d5d238696ffeacb03d
font_00_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 5436 bytes
SHA-256: 89e08ac990c8b2b91257fe87a881b562cd21db18ebb029887ae5b60613ed9f7f
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 11300 bytes
SHA-256: 0b0ab83a13fb502391899e80d2d79040b63dc3f227a450205f1f4c6d1ff0ac8d

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