Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc452e26fa905cd4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 13:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 111577d567b3443aecdc11b61c9b2219 SHA-1: 249cd2cfc48160dd888d79555396a8330c2db9ae SHA-256: cc452e26fa905cd487768d664f238f453a535fec3668e811189c11e29427e256
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a site offering a 'program antivirus free full version'. This suggests a lure to download potentially malicious software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=program+antivirus+free++full+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fcacc8c6d052.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/1803610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463275/normal_5fcc7d16f3d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_6022ce3848211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5fe3871ac7ec1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_5feefaf5ee6e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_603e2b5493435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd34dbfd0799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_602e35ca8f330.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/jarogefe_batufolux_babidulexigegoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5fc6442e64250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_603d534d862f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406497/normal_6004d257ea928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d96c75dbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_1a0858185b3a4a499946b765a8a20230.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_c3abe8471eba4307af8be855f12dc85f.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_67c394b4cd584c3b8ec5b1a6afe0f1a7.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_ebbc5fb137264c46b92ce210b8b1e857.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_c3c62c20f66b438fa1d2ad9587eb8c95.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 5148 bytes
SHA-256: 241cea344c057c62953778a7465c6f9f11e0accaf40c87f37cf868ef3ad88a28
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10552 bytes
SHA-256: e36345944dbc10ce4635e22734dedfd947e73db89bf96b618831ef91a6000f70

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