Malicious PDF — malware analysis report

Static analysis result for SHA-256 b756c31e6b2bb571…

MALICIOUS

PDF

86.1 KB Created: 2021-03-25 19:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: be87439786cd05f075bef1227a4dbb82 SHA-1: c8fac5d6ed660640c26903f4cda89cccb109aee7 SHA-256: b756c31e6b2bb57126732ca3c504cbbfa291d3ef5a3a04c97651039eaaf58518
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is classified as malicious by ML and ClamAV. The document body, though heavily obfuscated, suggests a lure related to a manual, which is a common tactic for phishing or malware delivery. The presence of numerous links to disposable hosting further supports a malicious intent to distribute payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=autonics+tcn4s+manual+pdf In PDF document text
    • http://x-bionic.shop/39882774588ul5g2.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/mifevono.pdfIn PDF document text
    • http://bixuvetojotenes.22web.org/49294598594.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/8714060693.pdfIn PDF document text
    • http://itfamily.pro/xujaxitukefq9c.pdfIn PDF document text
    • http://damapilob.iblogger.org/73648170941.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/matricom_g-box_q2_setup.pdfIn PDF document text
    • http://remont-kholodilnikov.website/rom_tablet_samsung_gt-n8000drco0.pdfIn PDF document text
    • http://pilawufatazuka.iblogger.org/ethiopian_millennium_development_goals.pdfIn PDF document text
    • http://crystal-light33.ru/bissell_pet_stain_eraser_powerbrush_reviewsdgeer.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/stearic_acid_msds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_4edd50c39d504730a0f175a49b2af848.pdf?index=trueIn PDF document text
    • http://gitipezusev.rf.gd/colons_and_semicolons_practice_exercises_answers.pdfIn PDF document text
    • http://koxujitedosu.epizy.com/xeravudevunifuzikoritagu.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_e718c297c7434fe78704c95908cebc54.pdf?index=trueIn PDF document text
    • http://duzavito.epizy.com/high_wizard_farming_guide_ragnarok_mobile.pdfIn PDF document text
    • http://gowasikokini.epizy.com/gegodusedidakikonodajuje.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/mijanelokowebepagapoluto.pdfIn PDF document text
    • http://xokilovemu.rf.gd/14667891233.pdfIn PDF document text
    • http://wagamaxoja.rf.gd/86436278717.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 3132 bytes
SHA-256: 6a523c39974f8ce5b088b9f03b9d909a34af6972fba52fdf86fb532a745da79d
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 5280 bytes
SHA-256: 3c4fff99eb6d1636f580d75a1022620dbfa65d9677712375337412521628ea16
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 11704 bytes
SHA-256: d5719baddcfc3299362cc883ec36b6346acda04787833e9000ed3e32fe2fb5ad
font_03_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 16364 bytes
SHA-256: 0b83617ae3aab9eac43040fe62b7235c7421f74ce68646cc95dabf3af1f8b955