Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e4b7109a211f24…

MALICIOUS

PDF

80.7 KB Created: 2021-05-25 13:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a2810289f4be9eac992b8fea4d50cf3 SHA-1: bf61bd47f759a7588fddea0a0af59229e896f12b SHA-256: 54e4b7109a211f2418b128c079a2e38da5f0f3d55d7c79cdb5170eff152b68fe
186 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain search query text related to weight loss, likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=what%2527s+the+best+exercise+to+lose+weight+on+your+hips+and+stomach
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/zoxitisi.pdf
    • https://bijepete.weebly.com/uploads/1/3/4/3/134378827/wekemokirofebe.pdf
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/pazudujiz.pdf
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/xizoxuzamatul_xexidawir_xogilif.pdf
    • https://gatobutapasi.weebly.com/uploads/1/3/4/3/134364099/sejuf_geribuw_puwuxikunaruros.pdf
    • https://static.s123-cdn-static.com/uploads/4505771/normal_600274938358c.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/16ad34390.pdf
    • https://golujubomo.weebly.com/uploads/1/3/4/0/134017735/kuxazobubo.pdf
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/d5ac9c.pdf
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ffd638566e6a.pdf
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/7890188.pdf
    • https://cdn-cms.f-static.net/uploads/4478383/normal_603c769d88023.pdf
    • https://cdn-cms.f-static.net/uploads/4424672/normal_601ab7d157cfc.pdf
    • https://nezasofesaz.weebly.com/uploads/1/3/5/9/135961661/6567806.pdf
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/f8d6cbf8.pdf
    • https://cdn-cms.f-static.net/uploads/4445544/normal_603936b559cb5.pdf
    • https://teduzagegoxow.weebly.com/uploads/1/3/4/4/134400331/3657007.pdf
    • https://dovesexafonom.weebly.com/uploads/1/3/4/7/134702519/xidanujotunatobez.pdf
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6062c8360e732.pdf
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ffb23377d0e2.pdf
    • https://static.s123-cdn-static.com/uploads/4486041/normal_600122c341389.pdf
    • https://cdn-cms.f-static.net/uploads/4458849/normal_603157a6adf34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c8f40833-bed2-497c-af8b-80da4a830123/zixosuloxidowazubufiteraj.pdf
    • https://uploads.strikinglycdn.com/files/aac4cfc6-0342-40b3-a10a-474fc870e23f/world_map_with_latitude_and_longitude_lines_printable.pdf
    • https://uploads.strikinglycdn.com/files/10a5f84c-aa64-457f-be8e-c467568b013b/43690823087.pdf
    • https://uploads.strikinglycdn.com/files/4df658e5-08ca-4162-8327-25d3e126f9df/16253279273.pdf
    • https://uploads.strikinglycdn.com/files/f7b4a252-3023-4837-9ede-81388f91dbe6/is_vibrating_rocker_good_for_baby.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a2.bin
e034ca37427903acbf287ef2c94440fe2a5563a2877d4a2f1ff598496e21e151
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 5936 bytes
font_01_sfnt_off00010dd4.bin
c07a678ce093a719edcbbb3aea4fffc696608b90b348fb93856a171f0cf9220c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 11336 bytes