Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b0e9532fd4905a…

MALICIOUS

PDF

88.6 KB Created: 2021-03-26 13:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70e7cc19b238739e605311d956ea18cc SHA-1: bdb715fdf40ad82175bfa2fba56a2094df1ee524 SHA-256: a5b0e9532fd4905a76b16d5bddd40a6255d8bd4b6b0daaa307de790c7a0f7fe1
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=vehicle+blackbox+dvr+manual+romana PDF link annotation
    • https://cdn.sqhk.co/nepofigiper/giahbia/jonubekipuwamoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/iBXhfZx/jaza_credo_download.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/gozawudedarom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fc90919c6d0e.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/jAnfzB4/exorbitant_time_in_a_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/jUihhef/microsoft_teams_background_images_folder.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/dozebuzetuv_doxepajavizim.pdfIn PDF document text
    • https://jutulomivepira.weebly.com/uploads/1/3/4/7/134775876/67427266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600d8d53570df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fc6ab99441c0.pdfIn PDF document text
    • https://luxederobidurip.weebly.com/uploads/1/3/4/6/134603039/8737272.pdfIn PDF document text
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/gepejemufusivit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_0ea326c2ed6b4bb3993101a3e30df0b0.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_e2f1b49682004cb987e9f84418717af8.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_1c7b94f88d6642d5a518b823a95530be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b82a06-1437-40ca-848d-82bad6efc446/14281513408.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_c24170c48f3e472f98e6f8cd61facfe6.pdf?index=trueIn PDF document text
    • http://satuwegalenez.epizy.com/location_tracker_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caf1f45-0841-4eaa-929a-f6d281edd89a/how_to_replace_belt_on_dyson_ball.pdfIn PDF document text
    • http://bimogikit.epizy.com/bivejamaxoj.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_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 5296 bytes
SHA-256: e82d80e9cbf65597901dd2e614552d34c8999fb715712e4d5290e95c655323ea
font_01_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 11204 bytes
SHA-256: 963180039cc4fd2e251af365d3e039b7d77846d389d665b83670186e86217802