Malicious PDF — malware analysis report

Static analysis result for SHA-256 e807567b3c646644…

MALICIOUS

PDF

117.1 KB Created: 2021-04-01 06:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aedc10da646fed8f2de88a92b1dfbc92 SHA-1: e0ebf4dc911698751e0f88c379ea3f29b236ca2d SHA-256: e807567b3c6466448fefd87e75b973f09918054da27b14e4d862d1f9ec4192ea
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 payload. It contains a large number of external links, many hosted on disposable domains, suggesting an SEO link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF creation, and the presence of embedded URLs points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=malcolm+baldrige+self+assessment+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5fcab628d0ca0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376125/normal_5fe2f1db97221.pdfIn PDF document text
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/4010f8e5367.pdfIn PDF document text
    • https://cdn.sqhk.co/nodebono/hbI6gea/mikecrack_youtuber_wikipedia.pdfIn PDF document text
    • https://vurikiwuguwek.weebly.com/uploads/1/3/1/4/131408439/xivun.pdfIn PDF document text
    • https://puxinuvusovi.weebly.com/uploads/1/3/4/3/134340416/6a54bf24.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/ditodagodule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fd8611d1061d.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/eguBkje/rtc_route_208_las_vegas_nv.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/cgjzhjg/ap_gp_hp_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/dgcjdjc/loweweporubujavuneri.pdfIn PDF document text
    • https://minufagotokuwak.weebly.com/uploads/1/3/4/4/134489045/suduj_sivamiwutupi_fokegulebidiw_vuwopijijanu.pdfIn PDF document text
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/gepiminona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5feb328fa84a9.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/sizutivol.pdfIn PDF document text
    • https://cdn.sqhk.co/perekowemo/FgcCEgg/jamezokabojirujogesugor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b7e3ba0c68924d4eb892f101f6857184.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_7f01bf458c3742cea2be2d8d8994c873.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
    • 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_off00017522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17522 5620 bytes
SHA-256: 5f7ac59b96ecd64ff2e2a9f10fb4dfc3e9f8fe58ea493519c6be18a35973023e
font_01_sfnt_off0001882e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882E 11876 bytes
SHA-256: 559bfb80b7bb1810378c2222691c831594a92e1a4a281e54fd6f16dd08ed6458
font_02_sfnt_off0001b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0DB 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d