Malicious PDF — malware analysis report

Static analysis result for SHA-256 2801581ba9802311…

MALICIOUS

PDF

81.2 KB Created: 2021-03-31 16:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 462aa722454f8f7a5bf750e0262d923b SHA-1: c1bb6bcdbd5db8824293822bda989de649bb86d3 SHA-256: 2801581ba9802311f25f4b6207b5a78d8c34add929fa87005316c59548d7e02a
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://druttle.ru/award?keyword=list+of+biochemical+tests+for+identification+of+bacteria+pdf PDF link annotation
    • https://cdn.sqhk.co/kitatoze/fwhiXHQ/junaruvonebole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_603333b3b734c.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/9149852.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/goxisi.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/16259747802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6059d6f9255ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_600afdce37157.pdfIn PDF document text
    • http://kanshoper.site/constipation_in_elderly_guidelines9u2gc.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/iehavji/medudoluzagexuxobufazeje.pdfIn PDF document text
    • http://topstop.site/action_replay_dsi_operations_manualisg6h.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/nabavoki.pdfIn PDF document text
    • http://hookup681.site/hansel_and_gretel_story_summary_with_picturesrohvm.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/fidoropasopekoviwid.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/25597856387.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/why_is_my_galaxy_s8_not_connecting_to_wifi.pdfIn PDF document text
    • https://cdn.sqhk.co/pipidopowewe/jasrJt5/nirusukovosifo.pdfIn PDF document text
    • http://sarkife.site/sosigojelowetizemupelzmbis.pdfIn PDF document text
    • http://20970907.net/zixigekosifipenavefetopnvc7.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/cierGjg/claw_machine_toy_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5feb2928431b1.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/5d235.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_e900924aebac4793868015aa702add0a.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_5bdbd4fb86d14a73a52f2522d1b42486.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_ca87fed9108149f9af3c103c7d986070.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_8bb75b2cd68e4865af3c585df136e84f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 5476 bytes
SHA-256: 523e479074dc936a7f3f837b1810340cfe5e7339e950739db7caad4bf0b884fb
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 11400 bytes
SHA-256: de1a68c068eae06717545daced6e897e18ee68f17e23bb153db9111bd5cb18f2