Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dc810ae26a67bf…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 09:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 719dc3adb0b67ad9e80019e2f9bbed02 SHA-1: 191323080e5e7c681c39a328eed03e0a163e4110 SHA-256: a5dc810ae26a67bfd0eb176a38668dd01b4271f252c521e42fb0ef5bcae543e3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to engage with remote support tools, a common tactic for social engineering. The numerous embedded URLs, many pointing to disposable domains, suggest an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/award?keyword=western+digital+wd+tv+hd+media+player+firmware PDF link annotation
    • https://cdn.sqhk.co/pugirunosamo/AAR7jaj/15508417337.pdfIn PDF document text
    • http://ig-copyrightnotice.com/mucusless_diet_healing_system_by_arnold_ehretjzmza.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/mukiwugazuvwmw8y.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/bemofuzakibew.pdfIn PDF document text
    • https://jawemojope.weebly.com/uploads/1/3/4/3/134399256/jagokigal_zufur_kiwifuwok.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/788fdac9.pdfIn PDF document text
    • http://love-cosmetics.shop/87431504509ch7r1.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/bomumup.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/jobirel.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/hjhaM9q/govimixegunikutisudid.pdfIn PDF document text
    • https://cdn.sqhk.co/lunajevon/CVXaifJ/13970902945.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/vexijasibudewi_setober_titilemimewux.pdfIn PDF document text
    • http://zathkatow.xyz/4944914985942zkj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimifad.epizy.com/convert_to_word_plus_crack.pdfIn PDF document text
    • http://ruwapebubori.epizy.com/atlassian_confluence_template_erstellen.pdfIn PDF document text
    • http://bumufemukelogik.epizy.com/suzaririrulejuba.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/57662869487.pdfIn PDF document text
    • http://xovimed.rf.gd/niguvajazezutu.pdfIn PDF document text
    • http://wufiwujexuwinaw.epizy.com/52038713760.pdfIn PDF document text
    • http://besikinugid.epizy.com/tipos_de_anemia_veterinaria.pdfIn PDF document text
    • http://jufakoxageponuz.rf.gd/online_creative_brief_template.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/grammar_review_quiz_with_answers.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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 5720 bytes
SHA-256: 5c65ae7b9f222d4a8fe2b6e39e46e2a1782663231fe82bc10eabf8d22249c00c
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10252 bytes
SHA-256: c5f5159433ce3e0235a43a6b0847cbb7081765a8c4d733eedba0d02bc13a8a5d

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