Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9863b9bdfc99a4…

MALICIOUS

PDF

89.9 KB Created: 2021-05-11 14:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5b70db38f625afa75072c6be1def8187 SHA-1: 2cb085bb8c017d9714618e4217c81f9f6bdb8ba2 SHA-256: 3b9863b9bdfc99a4d00955e81fa9d5931be321bb7d68b04274b501383d3d8cdf
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious payloads or phish for credentials. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

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.
  • 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://pelibifir.ru/strik?utm_term=dunkin+donuts+nonfat+latte+nutrition PDF link annotation
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/7e6e9db7c.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/application_of_trigonometry_problems.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/low_calorie_sweet_snacks_indian.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/8941261.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/nododowoxakozasilumus.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/the_500_hats_of_bartholomew_cubbins.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/kadexixitow.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/traxxas_tqi_transmitter_reset.pdfIn PDF document text
    • https://feketofemij.weebly.com/uploads/1/3/1/4/131452988/17940ede808.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/kejesixikuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/sukibo.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/physics_1_chapter_2_test.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/mandala_bed_sheet_near_me.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/baxetunavogegaxoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d397dbb6-6d7b-4971-bd7d-17aee6df3a76/5752143326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c8e054-5461-44f4-b8d2-73919980484d/40967066190.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/41429578419.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/call_center_scripts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4043b7dc-19fb-4e3a-8bf2-c88e84bf3f4b/nutri_ninja_auto_iq_blender_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a6746f-7846-4e69-a9c7-4141efb11e57/94947494211.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/61679046369.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_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 4964 bytes
SHA-256: 49c458a258be3518772fe8d47828d9f2995259fd8e41e39e75f8a20e5ad1e438
font_01_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 11556 bytes
SHA-256: 5ca9c8cd64695eae720449450c27db63087294e4264bdf5f72c3cc7a57b002fd

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