Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3dc698879217e1…

MALICIOUS

PDF

80.3 KB Created: 2021-04-15 22:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7b9e3ea066ff15bf702b532bdaf2baaf SHA-1: 7e5dac0c5b05f88df301e4a7d701e894fec40a0a SHA-256: 4c3dc698879217e117b44f694606862f55f24c8609e229e972701ca466d893a9
126 Risk Score

Malware Insights

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

The PDF contains an embedded link to `https://lozipotod.ru/strik?utm_term=ap+statistics+chapter+3+test+answers`, which is flagged as a malicious URI. The PDF is also identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=ap+statistics+chapter+3+test+answers PDF link annotation
    • https://cdn.sqhk.co/nepajenine/hbhhKgf/52115698194.pdfIn PDF document text
    • http://forpost-electrica.ru/songtext_the_power_of_love_celine_dionm30zk.pdfIn PDF document text
    • http://bluetea.space/arms_reach_co_sleeper_brown8ktks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601bba2071206.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/Hhbjbic/tuning_fork_sound_healing.pdfIn PDF document text
    • http://dommasters.site/4110431934601nt2.pdfIn PDF document text
    • http://topdouche.xyz/58805613413ytj1z.pdfIn PDF document text
    • http://smartcreditscore.info/97252628523kbd4l.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/eiehj0U/45936962427.pdfIn PDF document text
    • http://casser.xyz/honda_gx340_parts_catalogmjnmz.pdfIn PDF document text
    • http://bixofonan.iblogger.org/71497656270.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/d3NBhhf/83170192316.pdfIn PDF document text
    • http://leftoutclub.com/vugonulofevavikt2fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd7a1f9b991d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_76a60574cd6a4a2bb5c041d086478ac0.pdf?index=trueIn PDF document text
    • http://vegodaravowes.rf.gd/beautiful_disaster_english_google_drive.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_00b4c131138448468b49fdcea4763015.pdf?index=trueIn PDF document text
    • http://wifiwaxaranuf.epizy.com/59006353575.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_19432227d73f4d3e8c0fa94c07baf7fc.pdf?index=trueIn 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_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 5236 bytes
SHA-256: 42b6227232e3698c99e0024e1a8c26bd0dfd19d5fca44ebb15ef2b85c20950d1
font_01_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 10848 bytes
SHA-256: 065e720bee3555c9187e813b4eb96ec2e39eafc0df85027be16f4f065802bcf2

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