Malicious PDF — malware analysis report

Static analysis result for SHA-256 11141b7de1d4b82a…

MALICIOUS

PDF

71.7 KB Created: 2021-03-30 07:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dddc416f7e1beed2e20389f20612174 SHA-1: 3284564d6de2b6d893225301d28458bad8517dc5 SHA-256: 11141b7de1d4b82ac457e9522802234c04e9e019be6a9baf140b72d3d7706fdb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to direct users to phishing sites. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=robinair+vacuum+pump+parts
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/369fdb5b0.pdf
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5fdc77a893d68.pdf
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/620af0.pdf
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5feb1a85684f6.pdf
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/e9d47a0.pdf
    • https://cdn-cms.f-static.net/uploads/4449771/normal_60418be77536c.pdf
    • https://cdn-cms.f-static.net/uploads/4409118/normal_60159a59a2893.pdf
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603144d06bd1c.pdf
    • https://cdn-cms.f-static.net/uploads/4417656/normal_605a9e6d9f5fe.pdf
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5ffd7da46032e.pdf
    • https://cdn-cms.f-static.net/uploads/4378390/normal_605ba63abc177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jolozidabi/how_to_use_the_art_of_seduction.pdf
    • https://s3.amazonaws.com/lekelepowo/advtech_annual_report_2018.pdf
    • https://uploads.strikinglycdn.com/files/6f876ba0-9637-4427-a618-49cf9dfb1c4f/10671928539.pdf
    • https://uploads.strikinglycdn.com/files/ef41280d-ba44-45ea-acf3-f0bbe4464863/sub_zero_642_review.pdf
    • https://s3.amazonaws.com/lovomijelun/hands-on_machine_learning_with_scikit-learn_free.pdf
    • https://s3.amazonaws.com/fekife/bar_androides_barakaldo.pdf
    • https://uploads.strikinglycdn.com/files/4b4f971a-7bbe-4b26-a1ec-a613d008e46a/how_to_connect_microsoft_bluetooth_mouse_without_receiver.pdf
    • https://s3.amazonaws.com/zebarufuridorur/jofebanadis.pdf
    • https://s3.amazonaws.com/wanalovum/anna_maria_island_surf_fishing_report.pdf
    • https://s3.amazonaws.com/fuvidokibet/31029176812.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83d.bin
06e8f98cebbcd487e783672fb55b126b304f58898d49b8ed5e2fd9a129094482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5256 bytes
font_01_sfnt_off0000ea11.bin
ccd91284d9cbcd589d88f7b4d717482449261535354113533e2cf0dee38d5b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 11260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.