Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc16eba1d972a05…

MALICIOUS

PDF

80.0 KB Created: 2021-06-06 23:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 90e4bed9716142b5ed273f5a6215a1f7 SHA-1: b26124806e8782743ad604aa2cac2c19c06bfb8b SHA-256: 7fc16eba1d972a0597080604c5819ba3e93f313c72784b9f55ec93a08346f05b
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to delivering a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=converting+cdr+to+pdf+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413012/normal_604ce93f2fe37.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/dcf8cf.pdfIn PDF document text
    • https://gexawagezawa.weebly.com/uploads/1/3/2/6/132682787/jakovejureki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fca0f42c1b95.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/4035409.pdfIn PDF document text
    • https://suxuwimuwudex.weebly.com/uploads/1/3/4/6/134641155/8ba34e5b9.pdfIn PDF document text
    • https://wopaxosidavi.weebly.com/uploads/1/3/4/7/134732603/962f281646c902d.pdfIn PDF document text
    • https://jewepixixa.weebly.com/uploads/1/3/0/8/130814248/2951816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5fc8a072c2be1.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/9427f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_602a9f5647ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_6000f58f2fee5.pdfIn PDF document text
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/2220499.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/1680009.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/172635.pdfIn PDF document text
    • https://geligike.weebly.com/uploads/1/3/4/5/134590657/5088022.pdfIn PDF document text
    • https://watepiwod.weebly.com/uploads/1/3/2/7/132710700/aa692cec667fd33.pdfIn PDF document text
    • https://ligunoko.weebly.com/uploads/1/3/4/3/134308404/7672553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144447942/47025888138.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/bunker_hill_safe_sku__p45891_manual.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144558513/samsung_galaxy_grand_prime_plus_launch_date.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144448350/44622162624.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144527871/fomaxesovidokalevotoped.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/f/fnaf_ar_special_delivery_how_to_get_coins.pdfIn PDF document text
    • http://varulemenel.pbworks.com/f/3914666457.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/58005098975.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144628509/15429098311.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_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 4900 bytes
SHA-256: a2b287713a46a383a1f7d6eec5c6abd45235df8d48a62f58470d7702e3d07ba2
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 11044 bytes
SHA-256: fc94103cd3486331610c3a772bd3c9e30d94506b618e863635f630b666b3fddd

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