Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d18e528f06b4f0…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 19:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3cbb1ee8a14d7de43e646bbc509597a SHA-1: e6da34e9902c77ba7e79a00dc6ef77078b8f87d5 SHA-256: a4d18e528f06b4f0a28371be4818ae875389a366fac413214cc421bfc7e1d8de
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL identified is `https://jottigo.ru/strik?utm_term=samsung+ue32eh5000+smart+tv`, which likely serves as a lure for users searching for information about a Samsung TV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=samsung+ue32eh5000+smart+tv
    • http://lewodazegozi.iblogger.org/2014_cadillac_ats_owner_s_manual.pdf
    • http://wobokepukano.iblogger.org/kopefevajubanisepiluravi.pdf
    • http://good-production20.site/sekajezazapijozapivokovyo97o.pdf
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/nunexinozomoz_widuwi_lases_jixivig.pdf
    • http://hookup153.space/what_does_the_rattlesnake_symbolize_in_the_story2b1oh.pdf
    • http://heliusdesign.ru/microsoft_program_manager_intern_interview_questions6liap.pdf
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/givipibeji.pdf
    • http://insta-sale.site/30983885681i3vol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_7ead687b47da4ea485d67a9cb8def7a1.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/babylon_berlin_cz.pdf
    • https://s3.amazonaws.com/kelukakeb/78881422107.pdf
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_5e14786c361a4daca9c24641c43c9474.pdf?index=true
    • https://uploads.strikinglycdn.com/files/832cdd47-40d9-43e6-844c-538a84313c7f/51090175795.pdf
    • https://uploads.strikinglycdn.com/files/ef30f00a-1db8-4163-9917-b6db7b4bb0ba/6458950134.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_cb826827779d4cf2bbdb027bd0a5782a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/046cb64b-4923-4783-99d1-ffa7ce97c1a6/35173759734.pdf
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_877b4f64390147309e612bfdfa530607.pdf?index=true
    • https://s3.amazonaws.com/dovulavavo/8225356536.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_fafdabbb283541b3b1f83c00b56cf4bb.pdf?index=true
    • 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_off0000e8a8.bin
ec8768440f68a0530139185639bd87aedf801641c2675c7f890706cfe988037e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 5792 bytes
font_01_sfnt_off0000fc3e.bin
070fa3a6a9bf4c7a30213dbe7834785fcb62a16599586c202e9dbdef0e7b6ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 10488 bytes

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