Malicious PDF — malware analysis report

Static analysis result for SHA-256 9affa815c8dca335…

MALICIOUS

PDF

76.7 KB Created: 2021-04-18 20:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e296f90ea0ece3d4e9325949e1fcdbcc SHA-1: 9743eba85db29082e40ffaa47fff87d3273c9ae1 SHA-256: 9affa815c8dca3357657a709862505791418e1190792e9883279a3a28659bf8b
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a 'waste king l-8000 garbage disposal manual', which serves as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=waste+king+l-8000+garbage+disposal+manual PDF link annotation
    • http://gafisisaru.22web.org/kingdom_tv_show_episode_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_605a571976087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_6046295856bee.pdfIn PDF document text
    • https://cdn.sqhk.co/revidifok/hifjgUg/funny_answers_for_are_you_single.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/ijqhisu/nogegatesejutobiwoxogurov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_606a1b33986b6.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/jhjeLgj/who_is_old_man_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6057bddf83928.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/ieNzhaS/alien_vs_predator_hd_pc_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_60298d1a1f457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_603c05349c5ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5fedaa825a1df.pdfIn PDF document text
    • http://wedudixunuluwef.iblogger.org/tybsc_it_syllabus_mumbai_university_2020_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tatovod.epizy.com/73900154181.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/walt_disney_world_park_maps_2018.pdfIn PDF document text
    • http://gurepabe.epizy.com/evidence_of_evolution_embryology_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/60191732886.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/xujapuko.pdfIn PDF document text
    • http://livukizaxavubip.rf.gd/why_did_the_renaissance_start_in_italy_essay.pdfIn PDF document text
    • http://runogonu.epizy.com/bus_eireann_tralee_to_cork.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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 5864 bytes
SHA-256: fcfb16294b60b3a024c3eec752beffa3e3a960ffe3d980de8191dc9a5089f898
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 10604 bytes
SHA-256: d55d8fef4983e91de5a94759266374e3419a5cb1a243fceb6e6fb601b8d064cc

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