Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49fee22a46ae103…

MALICIOUS

PDF

62.3 KB Created: 2021-06-07 04:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 148dc0306aaa0f68e82a2ce4df1ce28b SHA-1: 92c5d785ed9adef03c1d8b476170b37a75a11974 SHA-256: d49fee22a46ae10370d3dac0b7453eb6e6e776c5f00a279e5c427dc79362283e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, many with numeric slugs, suggesting a malicious intent to drive traffic. One of the primary external URIs, 'https://infrive.ru/pbw?utm_term=what+are+the+different+electronic+components', is likely part of this link farm. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm heuristic.

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://infrive.ru/pbw?utm_term=what+are+the+different+electronic+components PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471252/normal_6054ba7d60a06.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/11ebffd7b43e948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5ff824459ef85.pdfIn PDF document text
    • https://lemosipezo.weebly.com/uploads/1/3/5/3/135326275/zibad-lisijum-dizusa-ramobod.pdfIn PDF document text
    • https://fotapudugibinok.weebly.com/uploads/1/3/4/8/134899903/d541b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_60436fad6de4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_60462451bf4ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_605bc34268203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426551/normal_5fffe7d2005be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_601061cfb9900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_603aa185a303f.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/7dd27.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/ece46873-0448-4171-9f76-7a5a8c3b86ba/mebagukifarurufarifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e59b13-c8b0-4f15-921e-ccbfa1206164/22332288488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cc7761-3aff-44c3-9cad-20b4dc67d5e2/vewoxojububuzugoforap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c8cb68-1e78-4f6b-8faf-966bfaaef0a2/19239365475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322c3da6-aec1-48ef-bbb5-ead344b1dfc5/griddler_gourmet_by_cuisinart_parts.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_off0000bce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE1 5408 bytes
SHA-256: cb2056520c80e0b6ea1d6dec61d201abe8892345e96db4c9494ed944c7af0668
font_01_sfnt_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 8568 bytes
SHA-256: 9555c24cfbd2eeb5eeb14cbc0b60f12008c09863b99669933123c5348adb8345

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