Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7a1c47394e67a3…

MALICIOUS

PDF

80.1 KB Created: 2021-02-19 07:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb204ddf07b3d3443d45d77551148c3a SHA-1: a000544813dd746c9f280c1cbb3bf29d55483e1a SHA-256: 2c7a1c47394e67a31c67349ac1c19229b0f7dbb9ce9ca2e969f78c19a0f43f89
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm with 30 external links, many pointing to disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, such as https://jacksth.ru/strik?utm_term=dark+souls+2+scholar+of+the+first+sin+walkthrough+wiki, are likely used to redirect users to malicious sites.

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=dark+souls+2+scholar+of+the+first+sin+walkthrough+wiki PDF link annotation
    • https://cdn.sqhk.co/kifavubivelo/cNidgcv/tv_bingo_show_provjera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415052/normal_5ff0e8323a1eb.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/hgKgigc/oreo_ice_cream_cake_recipe_springform_pan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5fe608e47e6bf.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/YksGMHq/mibuzaminekivogogobefar.pdfIn PDF document text
    • http://gilutij.iblogger.org/6th_grade_english_grammar_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/hef3hfq/bloodwork_dc_comics_wikipedia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fc815334eadb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_600e278ca4622.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/RAjjoih/84554417448.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/duvojovagusu.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://kewivawegimomu.epizy.com/rumupudobe.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/o_level_july_2019_exam_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/cute_baby_girl_blue_eyes_images.pdfIn PDF document text
    • http://vilogitiligifez.rf.gd/saparit.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/vosujirebivudomopara.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/how_to_prepare_phenol_chloroform_isoamyl_alcohol.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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 5312 bytes
SHA-256: e4bc462c4f5efa9d8f4666790bf2e45573500f31396bc0ee6f0c07a47bbb7248
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10108 bytes
SHA-256: 31502601d611672f574cb185f5a8239b0d3c0a92e70162f6011ba109d3e252a3
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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