Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bffd3358aef3fd…

MALICIOUS

PDF

71.9 KB Created: 2021-02-28 20:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02e2fc1c60c9835dd134ed18ca8359cd SHA-1: 9a77141d3c8c8d4c249ebb11103db5eb8b223c58 SHA-256: 82bffd3358aef3fd6d9f6e0a00e4420ab4dc157b4465850b7e27589b43038ed6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wb?keyword=what%20are%20art%20activities%20for%20toddlers PDF link annotation
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/1fd6bcfb.pdfIn PDF document text
    • https://xaburopufazig.weebly.com/uploads/1/3/6/0/136051881/vivejideweveziwe.pdfIn PDF document text
    • http://tuwuzesuwew.iblogger.org/pefuxotigegokivez.pdfIn PDF document text
    • http://hookup153.fun/banco_de_preguntas_cultura_general_perucc49l.pdfIn PDF document text
    • https://pifisurap.weebly.com/uploads/1/3/4/1/134108900/sawomafetuxama_wenazajiwu_tugunilekug.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/how_to_use_verb_and_noun.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/hard_sat_reading_passages.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/best_calorie_counter_app_for_homemade_food.pdfIn PDF document text
    • http://neojust.ru/jozimibooxre.pdfIn PDF document text
    • http://zelopaqq.xyz/4980660999qebky.pdfIn PDF document text
    • http://world-wild-shop.com/is_the_nj_written_driving_test_hardf6rzl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonifovozub.epizy.com/waxidezeba.pdfIn PDF document text
    • http://batilirilalu.rf.gd/39052689432.pdfIn PDF document text
    • http://ziwebizivag.epizy.com/dating_website_design_templates.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/39693183169.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/30335970965.pdfIn PDF document text
    • http://famuruvif.epizy.com/kaduzixowowepupalus.pdfIn PDF document text
    • http://misopipe.rf.gd/zobofovebidutu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 5180 bytes
SHA-256: dbe0838c8b750cbf6c4984373e123c7c6e03a76482f0770a23fc3e4d5c1c7a5c
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10184 bytes
SHA-256: e24ddac09f100b3501c0ba25feb7cd9bdc93882be797fbbb0bfd1fdfc26a4a4e

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