Malicious PDF — malware analysis report

Static analysis result for SHA-256 488b39cb208d7139…

MALICIOUS

PDF

70.0 KB Created: 2021-02-22 02:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 734ec6b45016b17c7d588a4a94950c64 SHA-1: 123e91c619ef6ccee491252eae4b6d98faabb652 SHA-256: 488b39cb208d7139668ba97baa89a7605ea4d080c8fb120bb526288f97e9f7fd
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a URL leading to a known malicious redirector indicate a phishing or malicious content delivery attempt. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=1066+hacked+unblocked In PDF document text
    • http://knitfqph.site/moving_announcement_postcard_templatevr1s0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fe5d5afe67bb.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/0059016b13d.pdfIn PDF document text
    • http://barberking.best/waralulipogiga5pho3.pdfIn PDF document text
    • http://1fps.ru/sujisopa0ilw5.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/dokorubilipuji-wamezolajuzima-mekiwaruti.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/in_the_heights_2020_castlqrkt.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/9231213.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/givobegibe.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/toy_story_rc_racer_ride_paris1fgl9.pdfIn PDF document text
    • http://itasummer.fun/controls_and_systems_electrical_engineeringe5qiy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fe6981d3c885.pdfIn PDF document text
    • https://suxaniwaxunese.weebly.com/uploads/1/3/4/3/134385499/f9edb0701f.pdfIn PDF document text
    • http://usacreditmonitoring.info/is_itil_certification_difficult0xkfo.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://bukepajusoka.rf.gd/363232161.pdfIn PDF document text
    • http://luvomovasofigu.rf.gd/axure_free_with_crack.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_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 4964 bytes
SHA-256: a87fdace5c79996b987b5be5aeae619983db84d22112603042f43dcc92d44f96
font_01_sfnt_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10240 bytes
SHA-256: c0db00f14199ed93f7faefe063c92f2ace08e19033923aeb06f783f53a24060e
font_02_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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