Malicious PDF — malware analysis report

Static analysis result for SHA-256 18515aa18a0aee82…

MALICIOUS

PDF

92.0 KB Created: 2021-01-03 06:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 099089766c25721a33742fbaf8ee6055 SHA-1: 53267a23bc0d6b5ebda2d6af8bb642883b3738fb SHA-256: 18515aa18a0aee82aa63733f8c1274eefeaae22def856f48e8c904757fcf08cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical detection for a link farm and a ClamAV signature indicating a phishing trojan. The presence of numerous external links, including one pointing to 'trafffi.ru', suggests an attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=cisco+3750+x+manual PDF link annotation
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/saputobesiz-tuxiviz-zupatevadon.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/jesXhcl/99223532056.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/efdRUib/81199724967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_5f93bf2546f94.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/IrGRjdV/wallis_tops_jumpers.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/nWgjjic/33376300617.pdfIn PDF document text
    • https://zosumomaxin.weebly.com/uploads/1/3/4/0/134040430/dugaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fb2fe88b6680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2d3bb6-aae4-41b3-af38-dfac7b0962df/tofupetesokejigorimomiwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476b7e18-7b0c-46e5-897f-db391bcde858/82970887435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947ad4be-d5e7-46c9-b4ac-cbfa685a4843/44797941862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6097574e-a5d5-48fe-9bfd-95df1215bb68/what_is_function_notation_and_how_does_it_work.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 3468 bytes
SHA-256: 0930cd8ee41612e4ce932169d48b7a66f4ae4f546d43eb738ae1c1f50068f911
font_01_sfnt_off00012b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 5332 bytes
SHA-256: 98cad19a0b351527ee090303721556720e72e8e4e3c4650ea4d13b88c8f77565
font_02_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 10444 bytes
SHA-256: 42ea2f0dcd2766e94b12c61553f893fbb64a0046ec3e38260d53ae6f95a1d991

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