Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c13c1207f99c7d…

MALICIOUS

PDF

74.1 KB Created: 2021-02-25 09:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1ee3de0f0e421c5be3744d3362adacb4 SHA-1: 605ea063941afa0d6d45a5b89068c27c13140222 SHA-256: 40c13c1207f99c7d3d2bf509be3f80a8b25e4dba9e0ba3f3c3d2f1ceb9e51d56
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to printer issues to entice clicks on the malicious links.

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://bologen.ru/123?utm_term=why+is+my+epson+printer+leaking+ink PDF link annotation
    • http://curvepreloved.com/ac4_trke_yamaik3qg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_602c092bacfc7.pdfIn PDF document text
    • http://wwbook.org/relacin_entre_materia_y_energa_en_qumicapgmkd.pdfIn PDF document text
    • http://vanesifonemume.22web.org/43286060625.pdfIn PDF document text
    • http://moshon.space/kolotebovazodelalosamunuk4s8ru.pdfIn PDF document text
    • http://frankiearvelo.com/pulumumoruzozomizizilupaswqv2s.pdfIn PDF document text
    • http://recepty-dd.info/best_psx_emulator_for_android_freeaae06.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/vejisodapofegevirix.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/70341032830.pdfIn PDF document text
    • http://cmb-accueil.com/10228614075zc411.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/2aZlOjj/xusamevituxulozeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rukaxamusotaz.rf.gd/dapob.pdfIn PDF document text
    • http://vavuduzika.epizy.com/netflix_dark_theme_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 5200 bytes
SHA-256: 799bc69fb13acbb6a42bd13b817271cead16432b697ef616828eed66ba101c3b
font_01_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 10448 bytes
SHA-256: ad6b8a6e0114e03220364dfefe113147a8ee5360c1601ac8c740cc8fe2ef9f0c
font_02_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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