Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc53159a1e160f82…

MALICIOUS

PDF

117.6 KB Created: 2021-01-19 08:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f6ef92c433d92d2b2ca4d938b750d28f SHA-1: ae4baa02cb744d1f6c7a4b1ff5e8661afb8263e0 SHA-256: bc53159a1e160f827dedd0b520c59b9ac1f57053753481ab440a602f21f0a734
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, and ML classifiers strongly flagged it as malicious. While no scripts were directly extracted, the embedded links suggest an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=yuya+takahashi+youtube+channel In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd296fbecd2f.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/dD4jege/fepoledosabuku.pdfIn PDF document text
    • https://site-1168173.mozfiles.com/files/1168173/leon_s_kennedy_resident_evil_4_wallpaper.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/8084845.pdfIn PDF document text
    • https://site-1180825.mozfiles.com/files/1180825/mununipufidenuseve.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/BK8cIij/applocker_gpo_admx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488322/normal_5fe11ebab43eb.pdfIn PDF document text
    • https://site-1177810.mozfiles.com/files/1177810/download_laxed_siren_beat_ringtone_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/OcgeQOs/wish_memes_funny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5fd107c4d0505.pdfIn PDF document text
    • https://nenovalo.weebly.com/uploads/1/3/2/7/132712003/8489058.pdfIn PDF document text
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/46fdbeebc80626b.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/jyDhgid/35312069167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_5fa884d44f237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f8b03a4ce0c7.pdfIn PDF document text
    • https://sotasoniwolog.weebly.com/uploads/1/3/1/6/131637806/nemeratetudi-guzuj-mefusoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vobisobopimab.epizy.com/93596859903.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/chala_head_chala_german.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/7135702609.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/congressional_casework_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 30156 bytes
SHA-256: 246c3a939a5369fe207fb9cae36eed58fdfcdfabb3e4c382752486f268ae5cf1
font_01_sfnt_off000181a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A5 4940 bytes
SHA-256: fd27ab6d79e064fb75d5c4abf79058c76d57dbb37c56e950f61c62665b7f120e
font_02_sfnt_off0001926c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926C 12424 bytes
SHA-256: 6bd56c76ba0b21a10f8c9078190fd26a032c3af0d6319ae994cd8d65e0dac182
font_03_sfnt_off0001ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA44 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378