Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c99bf3181a2a44…

MALICIOUS

PDF

74.0 KB Created: 2021-02-22 14:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bac308ac1aa2506a4f50af9f35db88c0 SHA-1: e3d5d661165347f89a66dc55d0619a4d300f3aa4 SHA-256: e5c99bf3181a2a448f6d06a6050b2d896e10a141e0f83c14f80e10fc217f7d10
146 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a phishing lure, specifically a callback scam. Heuristics indicate it's a link farm on disposable hosting and contains embedded URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick the user into a malicious interaction, possibly by directing them to external sites or prompting a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=how+do+i+identify+vintage+marbles PDF link annotation
    • http://roskycnmx.com/is_disney_california_adventure_busy_todaymlsob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5fcf056b64ed9.pdfIn PDF document text
    • http://com-servers.online/25673889564c0yhf.pdfIn PDF document text
    • http://ecosbor.net/why_is_my_computer_not_charging_when_plugged_inshzom.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/wiegehi/26921242260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5fc8164ab933b.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/9cYS3hg/mazava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417138/normal_5fc5d3febb9c8.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/gcyAad6/62116567079.pdfIn PDF document text
    • http://testvvd.xyz/45561550112ugour.pdfIn PDF document text
    • http://mercelus.xyz/fundamentals_of_modern_manufacturing_groover_5th_edition_solution_manual4lzj8.pdfIn PDF document text
    • http://it50life.pro/80188759713sk614.pdfIn PDF document text
    • http://hdvideo.design/53074764906vqumi.pdfIn PDF document text
    • http://ulekschool.online/angielski_w_biznesie_sownictwo0ug66.pdfIn PDF document text
    • http://shoppingyxplus.xyz/music_sheet_for_beginners_clarinetuvg97.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/CruwIjg/vazodepebunobokosoweboxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/99844371351.pdfIn PDF document text
    • http://dukodisedibuji.epizy.com/wesixujomekonagejafunuk.pdfIn PDF document text
    • http://kamiwivexa.epizy.com/dujirek.pdfIn PDF document text
    • http://suredutika.rf.gd/mixidoxajodujajakavezakek.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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 5584 bytes
SHA-256: ec427966be1cea105ebe2d8477a77cee7ed09455fbf952d9ab58427e4bcabb7e
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10864 bytes
SHA-256: 635f593aa2452784584b87e61722f1b95d41e9fe9d3fe878e52ed53d4078d8fe

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