Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4469ad659d0f0df…

MALICIOUS

PDF

68.3 KB Created: 2021-01-07 21:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4fd5e1012ab4a7ddd431e26cc815ae55 SHA-1: 3b0bc0cb5cb2b4cccd6a8765c08ab14d47c7e022 SHA-256: f4469ad659d0f0df7d24a53734c5488e5c5b04972c5af7c533f07857d0d0ca5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('trafffi.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search results or distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=isotope+chart+worksheet+answers PDF link annotation
    • https://jejaxeka.weebly.com/uploads/1/3/0/7/130739175/dinuwegifunisepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5f995862eddd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fa2e30183115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5ff344f468898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fe930e5838f4.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/259325.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/5fc19a10-aa27-4d58-aa23-f7d47a10bf56/terraform_aws_iam_policy_resource.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791903b8-5096-4b1c-9d7b-9784047d34ab/nozepexuduweka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e023cc-8dbf-47b6-8968-ccd69b0275ec/musica_navideC3B1a_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a7b0ab-d52d-4b15-851d-8e0776b209be/galuposanekuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/dabifiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26fdd73-abce-473f-9428-44632df5d565/vituvozedopilukero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b46c4a4-464c-4bde-b454-e62c767e6efb/toxemegelenama.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/savilusetutoritobowo.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/40505218728.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/92919458505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed3b65e-c880-4b23-b2dd-959f4f1ce4c4/fogadawinudagomozalaza.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_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 5084 bytes
SHA-256: cf7ed47ae85c0299ef55f14b3194d2dba1ca2be9016d9e44c42ef5aa72748375
font_01_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10676 bytes
SHA-256: aed44347001d818a6b266cbc3fd01acee74bda640eb2e47501bb70bcd1868f5b

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