Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c2abe982866709…

MALICIOUS

PDF

74.5 KB Created: 2021-03-04 01:34:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b4a3aceba622e5c67287ac1992d0453d SHA-1: 49637d01effafc84d63ea42426147462e380d701 SHA-256: 20c2abe982866709c29562d79e4460273f91e25dea1f440aa9fdb9f807fa61a3
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. It contains numerous embedded URLs, with a primary one pointing to 'druttle.ru' which is associated with the lure text 'strong delusion bible kjv'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple disposable domains for hosting links, suggesting a coordinated effort to distribute malicious content or phish for information.

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://druttle.ru/123?utm_term=strong+delusion+bible+kjv PDF link annotation
    • http://fosonelotila.medianewsonline.com/99104699321.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/venatuzetepevuj.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/rotopuforova.pdfIn PDF document text
    • http://itwow.info/chevrolet_spark_ls_2011_manualrdvn4.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/taratimulilutumijo.pdfIn PDF document text
    • http://1fps.ru/fresh_ham_cooking_time_convection_ovenjh0l6.pdfIn PDF document text
    • http://sberin.xyz/79617894380ku3ut.pdfIn PDF document text
    • http://adv-workshop.site/majuxajupalememunuz0n08f.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/kimere.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/2019_rca_viking_pro_10.1_touchscreen_2-in-1_tablet_laptop.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/4135233543.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/sharp_objects_trailer_subtitles_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/ez_chill_auto_air_conditioning_recharge_sds.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/3324871268.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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5224 bytes
SHA-256: d3cbef19acdf988fe3e320e2be1e1780ccc58f30b98e47c903aeed0a3474b6e5
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 11328 bytes
SHA-256: 116f582b4f0bee8bebc074a11292d321b2e5244043930f6264046d3848b6858d

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