Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afbafacd39d074e…

MALICIOUS

PDF

83.9 KB Created: 2021-04-09 10:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 06ae2aa90defe3789d7f61a4ef880b51 SHA-1: 94057c27ad3b6e0d978f8b7abd07458fcca48eeb SHA-256: 1afbafacd39d074e1e44933ddb4f64e2f3aeb0b6651f4d7f8d2521e2b203ed07
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm or SEO spam campaign, with one notable URL being 'https://seumenha.ru/strik?utm_term=how+to+critique+rap+music+influence+modern+day+youth'. The document body, though heavily obfuscated, suggests a theme related to critiquing rap music, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=how+to+critique+rap+music+influence+modern+day+youth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417206/normal_604069d1d3448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_6019bdec36134.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/99193220732i72qi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fffb763a92c0.pdfIn PDF document text
    • http://torchqbfl.fun/my_account_etisalat_egyptuv7hs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_602d998518cac.pdfIn PDF document text
    • http://bodyita.space/screen_recorder_with_voice_and_facecam9q56f.pdfIn PDF document text
    • http://xeeewq.xyz/proper_squat_form_malepp72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_602a3f4837962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nakevoja/12989878032.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_94ad6ee8c1be486f91cf8b9619887090.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_0aa93f29cfff4e479447c4204ad33806.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_99c98b7f32804285a6879bcdb143e449.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_7c0256bd03824fc499f2b752ad46d94a.pdf?index=trueIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_c20dc0ade0b84f7b84fbda1229e21a4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/24432559510.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/hip_hop_reggae_instrumental_beats.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/72598283097.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/romifepumefifox.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/nisasevagizinot.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_93451bff04a044cbb9d831e0be376cba.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 5560 bytes
SHA-256: afb457e9fc523c4278b37b164a8bc217dafb3b1c2e169a2ce408e452b6863b4f
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 11228 bytes
SHA-256: c40f0be2d0d763d3dfa3ef3be2cfbf754f1e8539123e3525f5298c4e01764243
font_03_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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