Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f7318fae2303df…

MALICIOUS

PDF

78.7 KB Created: 2021-04-06 19:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44fb13e5b0e1a3ecf95228c362f607dd SHA-1: 7ef9cf0384b0e6d22f5ef4f06eb4ab22a46561c7 SHA-256: 41f7318fae2303dfb8877aa620fc23e68616c34dddf42a675abef3f2d894990d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

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://golowaki.ru/award?keyword=fiche+de+poste+assistant+de+direction+g%25C3%25A9n%25C3%25A9rale+pdf
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/3a770961.pdf
    • http://mofetopevufije.iblogger.org/83991344020.pdf
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/9495425.pdf
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5fdc9e1a364da.pdf
    • https://cdn-cms.f-static.net/uploads/4410191/normal_600f41b164b54.pdf
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/bawileroxe.pdf
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/vefenab_xoliduniji_boxojupimuxinab.pdf
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5ffd019ed83f8.pdf
    • https://cdn-cms.f-static.net/uploads/4366033/normal_6026cbbbd8dff.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_601098c7b087b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_c17cdb1346b54627b4476aaa7c697282.pdf?index=true
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_646b899656db48a6a4a52a256ac79667.pdf?index=true
    • http://dexifuv.epizy.com/48956344577.pdf
    • https://s3.amazonaws.com/pafiganovavi/comcast_dcx3400_remote_code.pdf
    • http://wovivujuxeko.epizy.com/fiwuduzufasuzamus.pdf
    • http://dukudolit.rf.gd/cartagena_plano_turistico.pdf
    • https://s3.amazonaws.com/zarelusipofox/jeremy_wade_dark_waters_tv_guide.pdf
    • https://s3.amazonaws.com/zonebon/math_workbooks_for_6th_grade.pdf
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_72391b2948f5413595cb77fe71f0455d.pdf?index=true
    • http://jokipuzovorije.epizy.com/laledogovurubutaz.pdf
    • https://s3.amazonaws.com/nonabafat/how_to_whitewash_wood_with_color.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_off0000f1cb.bin
c8232e655f23501e0e20f6d96ef292f6b5cc8db38b7df77ec3e4f77f1d37678d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5512 bytes
font_01_sfnt_off00010440.bin
565b657f7985a91e8fadbe4fbea04a8a79bf36a0718cc9bbcfdbc3ea8c0122ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 12196 bytes

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