Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bb11b5674c6f84…

MALICIOUS

PDF

81.5 KB Created: 2021-04-30 23:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89986e0d7d96d46c8ea22d1fe3285430 SHA-1: 232e7770f8c650ca8af3099e83eaec1922c107be SHA-256: c2bb11b5674c6f847b0399718c21ee47e6a490239f36c6bf97e6f1e97e08ce9e
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://midufefew.ru/strik?utm_term=does+tyson+die+in+sea+of+monsters PDF link annotation
    • http://kpupnov.pro/vans_old_skool_grey_suede_mensb2qch.pdfIn PDF document text
    • http://basvuruizleme.online/how_to_file_for_extension_for_unemploymentowxqi.pdfIn PDF document text
    • https://xupalodigodub.weebly.com/uploads/1/3/5/2/135298884/03f85221.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/3009381.pdfIn PDF document text
    • https://jazebaza.weebly.com/uploads/1/3/4/6/134662006/25597afdbcd467.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/sopusulumijifor.pdfIn PDF document text
    • http://com-login8.xyz/507928141541e70q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_f29ecf1b5ef54880a74a1126e6ebcc6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/35704090672.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/56959715357.pdfIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_4ce18db24804485a8f0ae5c4a8ba39b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/15040056769.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/60209911090.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_fe2dab02941049168dc3b263d646f389.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_683aa4855cf846c992a629b8a2466098.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/49223800668.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_54fda05c87b74d25b190a03ff561d54c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/jigiwukokomuxadopiru.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/maytag_neptune_dryer_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/can_i_delete_ntuser.dat.log1.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/tutudarulajevol.pdfIn 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_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 5120 bytes
SHA-256: 472d3f73d3fc637bf36ce258d6213967d953182af115c67fb4d177ebb38ae520
font_01_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 10948 bytes
SHA-256: f562ea0d331a7bed23659f00761a4a3e454e9173603035226376ee66d8bfb0b7

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