Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ae749f953248d1…

MALICIOUS

PDF

81.5 KB Created: 2021-01-09 15:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a50237e126f7324d7b27ca4f0953c0aa SHA-1: 6256b0e04066eb6ca23a7395d8dbbed88de1e3c1 SHA-256: d1ae749f953248d1d9773c50fd3bd3c655642d33b53a169d7e048cb4e5634840
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, and one specifically to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO-based traffic redirection. No scripts were extracted, but the embedded URLs and link farm structure are indicative of an attempt to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=eso+gold+vendor+prices In PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/4581879.pdfIn PDF document text
    • https://takozuvixisuwet.weebly.com/uploads/1/3/4/7/134716687/lorulilugajapuwi.pdfIn PDF document text
    • https://bezaxopev.weebly.com/uploads/1/3/0/7/130740011/lizegoganekelo-vemasekelikawa.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/YwLnDH9/15425231.pdfIn PDF document text
    • https://liwufodabex.weebly.com/uploads/1/3/4/8/134872973/bakubugufajo-tazurej-dojofofuviteg.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/jirasemogivepu_pewiwodar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f9ebee50e416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_5fe66eac78b48.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/chiMWih/sharing_gmail_calendar_on_android.pdfIn PDF document text
    • https://durabaseduxoj.weebly.com/uploads/1/3/4/2/134235759/6935075.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/xotopomaxakinu_tumukime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5fc435f5f1db1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fec1886e4710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_5fbc99880c232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5f9f9d6e454c2.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
    • 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_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 4756 bytes
SHA-256: c980edf59880f70343506e3b53125084f9f9c90f02a9d6d260c96fbb7f9bc165
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 10796 bytes
SHA-256: 0976f2fb352027217e4078d267fb0aa3d27f5c12a3815c6513871fd570bc7d13
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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