Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5131ce6e8bb032…

MALICIOUS

PDF

111.0 KB Created: 2021-01-12 12:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4196304f616a3206b023906e4fbb58a4 SHA-1: 1e3b21c597c6845b3ce77b531d2206f637a27dff SHA-256: 2b5131ce6e8bb03262a45abdeaa73012a4c18e700694c5a95b95c325ce1e2109
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate it's designed to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=4+hour+workweek+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff366b99ee11.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/dijl5Af/mobile_passport_no_longer_in_atlanta.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/5091773.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/GidG6ge/ludo_star_new_version_50m_bet_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/8YjhThi/nakusisugip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fa35be2c6987.pdfIn PDF document text
    • https://xunaliniwer.weebly.com/uploads/1/3/1/3/131398540/takiger-kekijuj-lawen-viluvojetiduge.pdfIn PDF document text
    • https://duzuxaxopukuka.weebly.com/uploads/1/3/4/6/134615532/bf78f571a.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jhCigjF/smashing_pumpkins_songs_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fdc33f11e694.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/7232215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5ff153e1362bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000152b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B6 11012 bytes
SHA-256: 133c33490c81333215c8ce3ddb31e065bb4d1a5ea1f7966af65670b6c315aa28
font_01_sfnt_off000176fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176FA 4856 bytes
SHA-256: 20d8f6d6216754e501143456259351a99ee9edf44cdc07ea25b59244021345a5
font_02_sfnt_off00018790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18790 11620 bytes
SHA-256: 198b45187390232dc076de2f09bd87c04a583a270c73c60deba7137498058cb1

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