Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8acdb41bb5d185…

MALICIOUS

PDF

162.7 KB Created: 2021-02-28 17:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 010561fe125f3d80c951d77e5831eeff SHA-1: 94093cdaa3214ca96b38e9881819d8991f8ed942 SHA-256: 3a8acdb41bb5d185839623a70bd1805886cf016cdd2f6f43ce3e8945bd073139
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://maypoin.ru/wb?keyword=brown%20vs%20board%20of%20education%20summary%20pdf PDF link annotation
    • http://successinyourlif.website/english-_russian_picture_dictionarytr891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_6001e3a7383c3.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/wegisukuxij.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/nififapekil.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/what_questions_to_ask_students_during_distance_learning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5ffdc55eb5a2c.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/jdhfjan/sakizudulogex.pdfIn PDF document text
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/paxefanenopozusuwuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_6033fd46c3f4f.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/larubuvarif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_600dcde0c69e7.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/30b537a03.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ihjzjae/liverpool_sport_news_liver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somukagokololu.rf.gd/chromium_iii_oxide_safety_data_sheet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000245c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x245C2 30876 bytes
SHA-256: dea18f61c2cec85ba9d3b11b0254f8a24bad6a048fb2329f301acd8c4599044c
font_00_sfnt_off00020adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ADC 5712 bytes
SHA-256: 0fcd5cda17c9aa74f121ac629f2db27ea9379ea1349da5d6c08c9dd6f8490701
font_01_sfnt_off00021e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E5D 11560 bytes
SHA-256: 648cfba75783d106bf243550c29301a8615f0cf2a2a17680c6444f5e24176ac4

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