Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b63ad3e87d133e…

MALICIOUS

PDF

87.4 KB Created: 2021-02-22 09:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 310c249e4e71425038b52a34ed85af10 SHA-1: 4fcbb852616dac69e3f06200c058e92c25586085 SHA-256: 13b63ad3e87d133eda146e956b0c0492fcf3af96d705208dd863c8d985f25df7
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one with a UTM term redirector, suggests a phishing or download lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=conwell+acres+of+diamonds+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fef12c58a612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_6033283e3e123.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/gelasa.pdfIn PDF document text
    • http://richmaya.site/togaf_9_foundation_study_guidel1hyi.pdfIn PDF document text
    • https://fisomekoxow.weebly.com/uploads/1/3/5/3/135326807/sewom.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/d5f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/guludagew/bn4qxdF/modern_fps_combat-_gun_strike_killing_game.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/kazojupopepopupovawof7tovx.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/ggGV3Qc/uk_cruise_companies_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5fde678589226.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/tajivegeda-paziwidur-tozafalagod.pdfIn PDF document text
    • http://wefigofozotime.22web.org/how_to_enter_page_break_in_word.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jcAMUhe/zombie_hunter_airsoft_pistol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481282/normal_5ffdd9e7d0e41.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/higdhdU/yandex_money_gift_card.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixipisorovebog.epizy.com/potezagabulimenu.pdfIn PDF document text
    • http://fapibudu.epizy.com/vakinovomudutotutodisoji.pdfIn PDF document text
    • http://menasore.epizy.com/gobapojojitemonivuvaz.pdfIn PDF document text
    • http://zovewopot.epizy.com/jipurajefixexite.pdfIn PDF document text
    • http://zofagozarifo.rf.gd/soft_skills_examples.pdfIn PDF document text
    • http://kefujuvaw.epizy.com/hebbronville_weather_report.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_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 5296 bytes
SHA-256: 6389fdb633b9c87120a8e0a6ab3345a1b9722f7b2b0f2cd16ba8abd7c861799e
font_01_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 11808 bytes
SHA-256: ee1bda5834b5c1d178faa0d0a19d0d8d6e0af10cfd91390157b69391260e0ba5

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