Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e133277578537c3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 02:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d972e4e5bb12e696528e43fbb0d735ce SHA-1: 3c4134a00ecafee87a4de472674a5c15738326c8 SHA-256: 3e133277578537c3dc5fa96682e15d9563a4ed08cc24a3fc368c788b221fefc8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous external URIs, suggesting it functions as a link farm to potentially malicious content. The presence of embedded URLs and the heuristic indicating a callback lure strongly suggest the document's purpose is to deceive users into contacting malicious actors under the guise of resolving a support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=cut+a+video+android PDF link annotation
    • http://beming.com/ressource/site-image/files/40846891382.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109100208135648.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/mubejazapevurunetoluxup.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210904164930.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/jalogemikefev.pdfIn PDF document text
    • https://derfo.info/resimler/files/tomirubometobetow.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/zirozugetirewoguvota.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/56381068140.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/7574197168.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/naviserapefuref.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/52720264609.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/45510794183.pdfIn PDF document text
    • http://budropol.de/Upload/file/62579290785.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/giwixefadaje.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nabiwado.pdfIn PDF document text
    • https://efnnma.org/files/file/2263298694.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zawivumumizafevebipute.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/85009167490.pdfIn PDF document text
    • http://vtaky.sk/media/file/47632828442.pdfIn PDF document text
    • http://grotech.in/userfiles/file/kevezevunomivawalujel.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/niledixalulolaxiniganonuv.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/41703128964.pdfIn PDF document text
    • http://epicridesnepal.com/files/delakalux.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 10224 bytes
SHA-256: 1221f1aac2f6dba79a98057308c4249e830ae4dc54159fb878d029f001c26a1a
font_02_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 17080 bytes
SHA-256: d467eacf27e7c918121ee0f8cc78b1d4f969634dfcfe5b125de707e71c8825ed

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