Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbcd7cb71fca81d…

MALICIOUS

PDF

74.7 KB Created: 2021-01-15 05:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fc608cb673c1ef337f1d79d72e16c370 SHA-1: 694f0413a17acfa9f50e38870d459601b4456760 SHA-256: 2bbcd7cb71fca81d374eddaff84a693cf67adb04d971521399f0043240f0d293
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion identified as part of link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=i+will+never+eat+a+tomato+pdf PDF link annotation
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/xogewosexez.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/Xpcgihf/93330886923.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/ice_cream_sandwich_comics_youtube.pdfIn PDF document text
    • https://site-1191111.mozfiles.com/files/1191111/29362437489.pdfIn PDF document text
    • https://zabamaki.weebly.com/uploads/1/3/4/8/134849969/3476450.pdfIn PDF document text
    • https://site-1167988.mozfiles.com/files/1167988/kazetopewegiv.pdfIn PDF document text
    • https://site-1178598.mozfiles.com/files/1178598/krita_export_animation_as_sprite_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/Ujj1ihc/yellow_pages_book_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dozuga/viduzumidumitan.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/27497309558.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/item_analysis_template_for_grade_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 4884 bytes
SHA-256: 79b1e7798e15163e24cdbfdbb7e8d942e9d9707b1d065e31dbe068e870e3d797
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10752 bytes
SHA-256: 0eb3f3601bcfdea7205e59e4e8218f111e09ec913b7e3b279d02a6b1e1c99bac
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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