Malicious PDF — malware analysis report

Static analysis result for SHA-256 780f981f1cecd154…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 16:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1ee76aeed21d292706e238b3d43ac7c SHA-1: 835c690fbc4db9f9f21c2a9d086e285901452556 SHA-256: 780f981f1cecd154b21041e484db014018d5e306744dc06367f60270dc452663
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=aroma+8+cup+rice+cooker+instructions
    • http://joriwolujuf.sportsontheweb.net/hard_spelling_bee_words_for_college_students.pdf
    • https://cdn-cms.f-static.net/uploads/4383314/normal_604a04d77f572.pdf
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/jegukuxuba.pdf
    • http://timinipitos.22web.org/life_finally_coming_together_quotes.pdf
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/1505711.pdf
    • https://cdn-cms.f-static.net/uploads/4468843/normal_5fe8f81827d87.pdf
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5ff2141dd36e2.pdf
    • https://cdn-cms.f-static.net/uploads/4419211/normal_6015b8b252582.pdf
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5fe8ed092fc1b.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/allegiant_book_3_download.pdf
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/xufixavebobo_wafuli_mivazuwimewaf_nupafelofok.pdf
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/pajotevafeserit.pdf
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/risewador_duwap_tivinifit.pdf
    • http://tixaman.scienceontheweb.net/84634257412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://derefoxawuziten.rf.gd/zumerej.pdf
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_5ff366ff694e44cf8c66a3679360dc95.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_096c113ed8d54e73948f9c5e2b05d887.pdf?index=true
    • http://futebowa.atwebpages.com/3_digit_addition_without_regrouping_worksheets.pdf
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_ecd2ca372cda4a42a04c5e04bf99e473.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_off0000f784.bin
7a05e521dc7fb55fb01d2fd90e157aab3bd077853b51d2967550c997f34bc8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 5296 bytes
font_01_sfnt_off0001096d.bin
ffdcbb3a9b1723c0ef47953ff2e72b84ffaac9d25f16024e55d2efb672c51e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 11092 bytes

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