Malicious PDF — malware analysis report

Static analysis result for SHA-256 be48f81dd2c11bdf…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 03:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dce60d9487e2d8ba7a53563c4a545462 SHA-1: 77dbe087281d9490f58f432008a04eb34d315673 SHA-256: be48f81dd2c11bdf907130fe17e197496aae419348888526deb221fc51b85c31
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'Stihl ts400 owners manual'. The presence of numerous external URIs, many pointing to disposable hosting and link farms, strongly suggests a phishing or malware distribution attempt. The primary IOC is the URL https://jacksth.ru/strik, which is likely the destination for the malicious payload.

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://jacksth.ru/strik?utm_term=stihl+ts400+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445534/normal_600aa9e198d06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_600875354b877.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/61670263587p5bzv.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/hbzDhe2/98517440330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450747/normal_5ffab29a0b1ed.pdfIn PDF document text
    • http://ketousa.site/gout_guidelines_australiafdbbp.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/hp_deskjet_f4580_ink_sainsburys8ryr5.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/AjdIbji/fezusamikeliganepiwowat.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/jfjf7tu/52181532595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5fdd065383439.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/cXibTia/xowexasogawededibudezifil.pdfIn PDF document text
    • http://okstore.info/9626370781qv6zc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_600a82b0a2ac2.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/jhhgjeI/reguteviporez.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/IhdsO2D/duck_hunting_waders_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22c314e-8bc7-4b87-a044-0e0b379d9bd1/can_you_sue_for_lying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f49d26-e81c-42a8-b41b-1061e14c21a8/rotesafoxokibij.pdfIn PDF document text
    • http://vutuzepen.epizy.com/samsung_nu7100_43_user_manual.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/wodonuzur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdb00dd-4bcf-4c6d-8211-759473f7e53e/what_is_the_roman_numeral_number_of_555.pdfIn PDF document text
    • http://wetegazepi.epizy.com/53615561881.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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 5348 bytes
SHA-256: dd86bfb527ea2ee715542917e568cec7fd7d4e5b061494fcba02b510cfcb88b2
font_01_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 10652 bytes
SHA-256: 5eea84f3f9c183e60aafc79118e74b78281e93472f538bb7903e1de0252d3358

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