Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b955b7178d63a1…

MALICIOUS

PDF

74.2 KB Created: 2020-12-26 23:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a52e8b95cdce5f53ad4605e71341c13d SHA-1: c12899f249255e4e5ed749b6e99a1065d5ab1d98 SHA-256: 34b955b7178d63a11bd7a0eb8fca9b4da4ac9b9fa3da749b69d3a1955dc81118
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The presence of a large number of external links, including one pointing to a known malicious redirector, strongly suggests an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=figure+convert+to+words+in+excel+format In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fd9676893ca4.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/towijulekad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5f9660fbda3c0.pdfIn PDF document text
    • https://bozuluxowefag.weebly.com/uploads/1/3/5/3/135349757/wijimonixojapewas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_5fbcf26357476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5fa200a7b5746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_5fa51bfe38da6.pdfIn PDF document text
    • https://dudezixibuwido.weebly.com/uploads/1/3/4/5/134529197/43c50c33a49741d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b4066ed3-d5f0-4a42-b0e7-f31ce63ac359/rojesiwupomilatemuxuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b87c514-f0f6-4b85-8922-7cc597fb53aa/pathfinder_hunter_archetypes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7c45d4-dea0-4680-8286-367846062a72/ponapabiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08edf31e-4d64-4d31-b125-f023520d00b5/pukovetogek.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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 5396 bytes
SHA-256: f13aa50737e9d7d2ccb2d1348ebaf91b863c4a323b78329374cb0d33d9a8a50f
font_01_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 10484 bytes
SHA-256: fc064b2b9c4a311ffe725787d9ef81fadb0063e1b61fce440d880bbd8a97b81a
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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