Malicious PDF — malware analysis report

Static analysis result for SHA-256 336b7dcdf8ba3e35…

MALICIOUS

PDF

94.6 KB Created: 2021-06-02 04:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 952addd8c28aa11394970bab3393c40f SHA-1: 77dc2a37cd196a4f964e613afa6feff690b71d26 SHA-256: 336b7dcdf8ba3e35316b4fcc104dcc349609591737882b5748db07c186ae7c7f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external PDF links, likely intended to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, appears to be a lure related to "Death of a salesman american dream questions", suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/pbw?utm_term=death+of+a+salesman+american+dream+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd6c2f5ae562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fd2c384c40ec.pdfIn PDF document text
    • https://jinunogafexaxim.weebly.com/uploads/1/3/4/8/134884933/kidivumuvaw-libizawez-nogevugowut-bilimibomi.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/1221725.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/a5fca3952939e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_606e10db0d33f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5fee048dc9c3a.pdfIn PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/jamojifavap.pdfIn PDF document text
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/galani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_6022c5abe8e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_600a449b23c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_60277883685c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019f6dfb598c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384828/normal_60b27a2f5dfb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_601845a0c82e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_603cf26546481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_604680e746872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fffd90f7c78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_6037c3e9223ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemulopawed.pbworks.com/f/kesowaxipilu.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144485625/60073799125.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/dijewitedobitu.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/are_there_any_movies_about_hades_and_persephone.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/witowuxomalanivetujila.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/f/2020_kitchen_design_v11_crack.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144486870/wivulixos.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144485058/oikos_of_the_olympians_items.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_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 5388 bytes
SHA-256: 55a61eac62b1bb7238091f41145986dc1bdfc874a3d6d38d3668199eca806e2f
font_01_sfnt_off000145a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A5 11904 bytes
SHA-256: 21e7c8d109ff3d87de2ef678862b9c4bbafbe01f6134e55c3782bcedb760f892