Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1d1d6bba620112…

MALICIOUS

PDF

76.4 KB Created: 2021-03-04 23:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ea0de23dd39a00c6ae5a406da00a3af SHA-1: 70a136e1a3a320816ac28911e249e74ae884eaf9 SHA-256: 1b1d1d6bba620112dccc2705c554e45baf4c834ec8ce74c51b3225c300155201
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting and appear to be part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to connecting an Xfinity remote, likely to disguise the malicious intent of directing users to numerous external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/award?keyword=how+to+connect+xfinity+xr2+remote+to+tv In PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/8649937.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/voribuxudewufaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_6030ee6dcff5e.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/55489538914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_60371ce10fd6b.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/guzuwujaxijawefuxejebavur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403270/normal_60385d6495eeb.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/6222449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6015219262694.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/duziwamen.pdfIn PDF document text
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/81c668e4e86.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/jgMhihe/pomez.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/3482034.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/cOt6ibF/rezegomajalulatopewovob.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/idHsBhe/jibavava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6026953c94883.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/BhfbCha/charge_apple_watch_qi_charger.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://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_e1eee583712c48118fb86ce64f1b16da.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_f7d803de40e2403997d99bf7faf941f3.pdf?index=trueIn PDF document text
    • http://zezofakarol.myartsonline.com/24461502461.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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 4808 bytes
SHA-256: 65625572132b8be112850f0bc87b7a6d24fece2fca436007957292806295174c
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10184 bytes
SHA-256: b482fe17b747de9e0bc750aa22409b5fc83fa25745018a3654e85ad85e021f33
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378