Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa4f4d3c923779b…

MALICIOUS

PDF

78.3 KB Created: 2021-06-03 05:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7025ae2364a3b30c5aa964711215ccb5 SHA-1: 341103aa10728088130e154726fe9ca5ac73d65b SHA-256: 2fa4f4d3c923779b6a71b53a15a33182d2403cb6b96f93ebad9c8264456664ea
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The primary URL, https://crewmak.ru/pbw?utm_term=free+network+unlock+code+for+sprint, suggests a lure related to unlocking mobile devices. While no scripts were explicitly extracted, the PDF structure and numerous external links, combined with ClamAV and ML detections, strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/pbw?utm_term=free+network+unlock+code+for+sprint PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470968/normal_6034d34bec3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_604a141321c27.pdfIn PDF document text
    • https://foxizogifo.weebly.com/uploads/1/3/4/6/134627616/9583259.pdfIn PDF document text
    • https://dobakilulujafej.weebly.com/uploads/1/3/7/5/137507855/25337da098fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6010fe87dffc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_60605358bf226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5ff22dc0dbaa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_603440de10948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_606a55bf17f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_605ac7d43ac61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_601d1b26d8f1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408879/normal_5ff9ab7612ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6017aef6a12d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fdf00ce39dc5.pdfIn PDF document text
    • https://buvebozu.weebly.com/uploads/1/3/1/4/131453495/6321077.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/dd9c92cd-0baf-42b9-bdab-55fbf128a9ba/tovitenuzazarusedolirezew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864064f6-fd32-4fb1-bf9c-9c1e070055b7/mikowewiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796dd84d-828b-47a5-bc20-b9c80595b43d/zesidupadupizepadawivafoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cda3a9-aeed-479f-bec0-3b1048d8a08a/dexewuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ee850d-c6a0-437c-86d6-53679a99dc4a/77845747004.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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 5048 bytes
SHA-256: 68e013171fc98d0a38324887fedfca3fc0824aad246262f7313baa2ec528ba76
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 11136 bytes
SHA-256: c9bbaebe996841756055913d7695b399e9d2d00c2b8db36eca7c821a9a1f4ba6

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