Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa307ef100f38802…

MALICIOUS

PDF

68.7 KB Created: 2020-11-21 11:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1bb7a7aa8fcf0c1e2bb6d2917e1665ba SHA-1: 92250c3c45f0c41857b0c8a2f8305ce0c28b2f38 SHA-256: fa307ef100f388020edc4a98356c7c5687ec2397fdcfedf7821f7cf36b2d0b8b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely leveraging the document's content as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=critical+writing+pdf+open+university PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f8a21c433b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa607879348a.pdfIn PDF document text
    • https://pudufanosi.weebly.com/uploads/1/3/4/3/134324904/gabaxevisezegom-nobabunidepo-fudojokevajopen-naxuj.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/c15770bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_5fb75bb7aeb83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f8a0c6cad977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f96c5cc03a94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/jspdf_autotable_line_break_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585212a9-d7e1-4d60-b00c-540faa1d16e2/steve_tropoulos_queensland_collabora.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/alucobond_sheet_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974dc64e-3563-4ac8-998b-86c1eeb348a6/gamawamajajifudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ab80d5-16c3-44e8-98f6-40b7255c087c/thing_thing_arena_3_hacked_unblocked.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_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 5480 bytes
SHA-256: de0ce1206c916f27a00f31ee881cb5b1f86f745236de44b415276beadb205bf9
font_01_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 10172 bytes
SHA-256: 9b772a64c1117c7b301adf56eb24cc03e1a1e241a1c8d588a0b1a7f8a1283935

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