Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc74cb6a14fb6b3b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-23 18:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2402ff71e9aeb31ec753877f6352131a SHA-1: 2528529deb7259dfa705230b7e56df4c73aecb66 SHA-256: cc74cb6a14fb6b3b66392ea561c18d6a889cd914ecd6c4eb8258615107330e0a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is indicative of a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs points to an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=the+american+republic+to+1877+worksheet+answers
    • http://callup.today/zofewilevidozia6gi3.pdf
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/1292335.pdf
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ff0b48e6c522.pdf
    • https://cdn-cms.f-static.net/uploads/4451228/normal_602f3b1be6a82.pdf
    • https://cdn-cms.f-static.net/uploads/4444100/normal_6018dec958dbc.pdf
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/mabal-mefinepuwev.pdf
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/zadimef-pirelopunopan-revosamuba.pdf
    • https://cdn-cms.f-static.net/uploads/4409243/normal_6013b924db6ca.pdf
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/fobalilatimoseti.pdf
    • https://bewarovawizijus.weebly.com/uploads/1/3/4/4/134454629/8943261.pdf
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6045104d3a8cd.pdf
    • https://cdn-cms.f-static.net/uploads/4467274/normal_603e5fde286b6.pdf
    • http://bcpreactiva-enlinea.com/29848773643pnenp.pdf
    • https://cdn-cms.f-static.net/uploads/4445745/normal_601973b3a9f08.pdf
    • http://beautysss.site/72080266909r5jje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/robumuduluwise/the_lord_of_the_rings_the_fellowship_of_the_ring_extended_edition_vs_theatrical.pdf
    • https://uploads.strikinglycdn.com/files/5662fc1e-bc76-4210-95fb-99da19c3de49/wabogazewal.pdf
    • https://uploads.strikinglycdn.com/files/a3524c69-3c9f-4eae-a85d-e5812af56d81/asp.net_core_video_tutorial.pdf
    • https://s3.amazonaws.com/vabedafozo/49723097799.pdf
    • https://uploads.strikinglycdn.com/files/18830ce1-e4ec-474e-b6ee-58e9bf91b820/49104886442.pdf
    • https://uploads.strikinglycdn.com/files/f8293ba7-22db-4ad0-80fa-c3fe73150a93/6340630320.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc49.bin
6670fffb38df9cfce5658308074f1a406278642c9865e4faaf3ecd22d6475edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 5624 bytes
font_01_sfnt_off0000ef55.bin
f0236df2579364b64b22d97635d71fd1f7e3f23dfa45dd9fcc2703f6cc3ddbfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 10412 bytes
font_02_sfnt_off0001129f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 4324 bytes

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