Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb13534f8c1c1415…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 00:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e536f04e81471b1d4481e7097961e473 SHA-1: 97af9abd0d5788502e6e73cfd5bfe9417805ba34 SHA-256: cb13534f8c1c141576a95bb5e1682b0ba258fa69c311ebea2a26dc83992ea21e
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it is part of a link farm or SEO spam campaign. The primary external URL points to a site that appears to be a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=directions+to+gig+harbor+washington
    • https://cdn-cms.f-static.net/uploads/4416140/normal_600cfbeee6a99.pdf
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/dorefujebapojax.pdf
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5fcd6336d8fc7.pdf
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5fdae45cbe0da.pdf
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/nazatirulijasipeg.pdf
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fc666a8201d1.pdf
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/8847474c.pdf
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/7043839.pdf
    • https://cdn-cms.f-static.net/uploads/4489041/normal_604a2857f0f6c.pdf
    • https://motazejiwe.weebly.com/uploads/1/3/4/2/134266269/340231.pdf
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5feee3653164e.pdf
    • https://cdn-cms.f-static.net/uploads/4393364/normal_6040e20f8e057.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voropa/bbc_iplayer_radio_failed_iphone.pdf
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_6aecdd28c8574844a6c173fbe27eb6d9.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_5cb9a6bf4f414a629eb19fb7249b6f4b.pdf?index=true
    • https://s3.amazonaws.com/tuxexi/best_offline_antivirus_for_pc_free.pdf
    • https://s3.amazonaws.com/lakujusitejojet/combinar_tipos_de_graficos_excel_2010.pdf
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_861f641d01c24577807969acaa47ddc9.pdf?index=true
    • https://s3.amazonaws.com/bagisi/kazafufemuvi.pdf
    • https://s3.amazonaws.com/juvetaso/ac_market_iphone_5.pdf
    • https://s3.amazonaws.com/guxosa/xadonexubukawunuwezom.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_off0000f7ed.bin
cd7bc789dcba51a00cf7550690e035c4cc1576e761e32e502a2f2012429ee1b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 5260 bytes
font_01_sfnt_off000109e2.bin
18c69689cc93d77d72f77e1fc46daca1b20416a668a5dbfcccfb09f12eef7590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 10820 bytes

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