Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b6924ccfc84480…

MALICIOUS

PDF

70.5 KB Created: 2021-03-28 18:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: df477187b935e13183feaae72978ca6a SHA-1: 2eae88415dda5decd8c78756d0e85462893b0de1 SHA-256: a2b6924ccfc844801d9d968f043e793563e450277db8f58c06ce8742225e9763
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many of which are on disposable domains, suggesting a link farm or redirection scheme. One of the primary URLs identified is https://jacksth.ru/strik?utm_term=powerstation+psx2+battery, which likely serves as a lure or initial redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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=powerstation+psx2+battery PDF link annotation
    • http://expo-kit.ru/70855123835mg1sj.pdfIn PDF document text
    • http://copyright-notice-ig.com/51079127905esgh.pdfIn PDF document text
    • http://begdas.space/xuwuxefejomebejuwasomixh6zwv.pdfIn PDF document text
    • http://bonifacy.site/adobe_after_effects_cs6_tutorials_for_beginnerszr62g.pdfIn PDF document text
    • http://storeeuro.info/cual_es_la_diferencia_entre_motor_de_corriente_continua_y_alternax8rd2.pdfIn PDF document text
    • http://dkmz3.club/baby_phone_number_whatsapp_addz9mh4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_57056018d0b14642a97f2b6f81cb60be.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_cf5278519f124d4180bf337f28ffdd2e.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_674908af518b44acb218c3f54d4cd247.pdf?index=trueIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_ac9fb641069240d69ce19ab3fb4196aa.pdf?index=trueIn PDF document text
    • http://welojorolepone.rf.gd/case_files_pediatrics.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_93680e7e4cc54d1cb4c910d2fdec43c4.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_16db221bb5ce40ab9d25344baf4fbdde.pdf?index=trueIn PDF document text
    • http://fekerudosepu.rf.gd/trends_in_the_periodic_table_worksheet.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_797daf3cd65c42c9baa711a61bd60a6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/incident_accident_procedure_for_reporting.pdfIn PDF document text
    • http://jagazasa.epizy.com/darepigevugev.pdfIn PDF document text
    • http://jagakemiwowinig.epizy.com/govegitigevutadukasuxe.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_75eb1c136ff34fb4bd21e2297c247630.pdf?index=trueIn PDF document text
    • http://lisunamubeso.epizy.com/oresteia_peter_meineck.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/fatigue_stress_concentration_factor_kt.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a1ab7077e1b9467c9108e1325daeede3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voropa/82851953477.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 5316 bytes
SHA-256: 2686b52672b0fec1ca9a97c8caccc90193237714b08cb88e1f7e77af65dd861e
font_01_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 10772 bytes
SHA-256: 4efdbdcdb9da828c3006bf8e1fad3f44a119f40aaae968ee64b65ef0ba80de94