Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b77dcaddfb1996…

MALICIOUS

PDF

69.8 KB Created: 2021-03-25 16:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d060ca628a19d6fad3aebbe7a1b1871e SHA-1: e03b175838e1c0106827c55f6a0c7e1962992e1c SHA-256: f6b77dcaddfb1996326513f1c325831b11ddd6362b0f23f6b44851efec68ba31
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=beautiful+red+roses+images+free
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fc610c0eabd1.pdf
    • http://berizala.22web.org/ncert_english_guide_book_for_class_11.pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_6028425a8fe94.pdf
    • http://jopuvalipi.22web.org/what_is_a_good_wattage_for_a_microwave.pdf
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/wiwubuf_nudapumoriziza_jaravo_wumiwelunexi.pdf
    • http://fojuzoxine.22web.org/clergy_appreciation_month_planning_guide.pdf
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/jawaji-fivel.pdf
    • http://purejup.iblogger.org/kedasaluwawojawezijuwevok.pdf
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/f8d020e.pdf
    • https://xikixunajaxata.weebly.com/uploads/1/3/5/9/135959014/nujurotowawon.pdf
    • https://zovuzutozureje.weebly.com/uploads/1/3/0/7/130739602/cb7d56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_978acdf374b34d9293726f5008c5b57c.pdf?index=true
    • http://weralawubuzeg.epizy.com/8705992477.pdf
    • http://wemiwapava.epizy.com/rules_and_regulations_of_darts.pdf
    • http://kabumutudera.epizy.com/lurogerimofinelotofeke.pdf
    • http://tudutov.rf.gd/rolaribemanofadu.pdf
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_512515c13ac441e7aaa20a7d0d207dc1.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_beca8c252428419f93d5bbda2a3373c8.pdf?index=true
    • http://jatojitax.rf.gd/kojatikusasudini.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_e16f32d105e342bc89c2a34c66af8eea.pdf?index=true
    • http://didaduxazej.epizy.com/tabivunoza.pdf
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_3fd203dea952454d91139ac5a1f99da5.pdf?index=true
    • 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_off0000d26b.bin
0017e3b8971746affb94f50a879489d1b2ef30380bd1c71a15c38aadb3bebb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 5276 bytes
font_01_sfnt_off0000e448.bin
21750d166319fb8b7e8b7e582b14a494a95e0536e66ba11ea2eeded35c81c972		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 10496 bytes

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