Malicious PDF — malware analysis report

Static analysis result for SHA-256 359aa433241f7e8f…

MALICIOUS

PDF

71.3 KB Created: 2021-03-03 23:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3621b97acbbfe53af2a3fe5be6f223f0 SHA-1: a03d499097ba88c4ede12a06992d73cf301cc5b9 SHA-256: 359aa433241f7e8f668caf3243c1e995f71976a21d98e469bcc1fda60b64ebbe
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 or trojan variant. It contains numerous embedded URLs, with `https://zajinet.ru/wix?keyword=persona+3+fes+dating+guide` and `http://misstourist.info/lowiwuson1xowp.pdf` being prominent examples. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=persona+3+fes+dating+guide PDF link annotation
    • http://misstourist.info/lowiwuson1xowp.pdfIn PDF document text
    • http://itrom.fun/cross_stitching_supplies_australian8sth.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/cjcgfge/woodsmith_magazine_subscribe.pdfIn PDF document text
    • http://boothattendant.com/bujew1u86c.pdfIn PDF document text
    • http://topdiscount.pro/510803954602yrby.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/73550570159o9of8.pdfIn PDF document text
    • http://xeeewq.xyz/virtual_piano_sheets_minecraftkye1k.pdfIn PDF document text
    • http://thiswaytovogue.com/69076381359e7va0.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/gijeNzz/bilefikusixerezugatelawix.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/ifrBjdy/find_hp_switch_ip_address.pdfIn PDF document text
    • http://baykamif.space/radirawozozoporawixejebibp93xw.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/hagcjYa/xikoburezafajevut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilidax.epizy.com/the_laws_of_spirit_world.pdfIn PDF document text
    • http://zafebofegev.epizy.com/2011_jeep_grand_cherokee_maintenance_schedule.pdfIn PDF document text
    • http://jimagonekitop.epizy.com/fesorejaxaguvevududuso.pdfIn PDF document text
    • http://faxanudof.epizy.com/gopro_hero_3_camera_manual.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 5208 bytes
SHA-256: 2f66518877c8dfafe2b8ecd3ba06b226ed3de690a566b07e1bb24075169396e5
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10052 bytes
SHA-256: fcfa6a98cbc3e5c2eceddbda604bd53e32526be14c288f0e9cdd5b7784c79970

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