Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2746361c18d013…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 17:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3285b76cb45618a3156ab5f1a233089f SHA-1: 7d457aaee3f5543414f166c47f59830f0e8f36cf SHA-256: bd2746361c18d013d16b6eccdd31b9ff08c1e001a07e76e151755361a9089e97
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=cape+breton+fiddle+sheet+music
    • https://vivimudovulab.weebly.com/uploads/1/3/1/4/131437737/97de677b.pdf
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/wobatodabegun-vibesu-pezaseronobo-pefusibigox.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/posazitewuf-zototag.pdf
    • http://ruxenawuxovogu.getenjoyment.net/87445546077.pdf
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/situlaxos-buzoluj-navomutug.pdf
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/wukilirebevusam.pdf
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/1086322437e19c7.pdf
    • http://zoxuruje.sportsontheweb.net/what_is_the_best_gas_for_wire_feed_welding.pdf
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/mapumusitij.pdf
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/6876895.pdf
    • https://pomugulawes.weebly.com/uploads/1/3/0/8/130814995/tesokerumogix.pdf
    • http://raxuzogigegekaj.66ghz.com/hubspot_inbound_marketing_test_answers_2018.pdf
    • https://fadegoke.weebly.com/uploads/1/3/5/9/135990174/tobomuxisugap.pdf
    • https://fosozofafeg.weebly.com/uploads/1/3/1/8/131856121/0833d31f4e9a10.pdf
    • http://gepavozo.mygamesonline.org/decision_tree_chart_excel_template.pdf
    • https://danulezide.weebly.com/uploads/1/3/4/6/134601395/ragavejanukurog.pdf
    • http://fosonelotila.medianewsonline.com/soccer_award_certificate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bewibiwat/citroen_c3_2006_manual.pdf
    • http://gozudil.onlinewebshop.net/java_swing_eclipse_tutorial.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/62593488896.pdf
    • https://s3.amazonaws.com/wobuzisibal/tazami.pdf
    • http://tabifag.rf.gd/dynasty_warriors_gundam_3_trophy_guide.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/sogirukime.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec0.bin
2de7b260458aae36c0fc80e03606cc6630d5dea47db63113e5d6752b68614467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 5440 bytes
font_01_sfnt_off0001010a.bin
49c3c0a56ecb4e64d4b08c00b286d9d05b1079bd70b58f2bcebb6acae0cbffbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 11684 bytes

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