Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b52ba3dca0d7c9…

MALICIOUS

PDF

69.8 KB Created: 2021-03-12 21:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1164c140de38dfae8acb1b0ee8e86a91 SHA-1: 1ee7ec23ce3d8fc3f04560887323ecd299dcf2dd SHA-256: 44b52ba3dca0d7c9b82615541b7c959b0db399f3ff53eb5f77d44d508838f862
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed for SEO manipulation, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain keywords related to 'fantasy football cheat sheet', indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=2019+fantasy+football+cheat+sheet+pdf+yahoo
    • http://stnold.com/kojumi4l8qg.pdf
    • http://rorureferujuraf.22web.org/canon_camera_connect_app_for_pc.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/43b581cf.pdf
    • http://dimax-matrasy.ru/45527094189z24tv.pdf
    • http://hookup681.site/best_brain_apps_for_seniorsy2ddc.pdf
    • http://gromstroy.com/533979332852zx9m.pdf
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/562d02851f05e4.pdf
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/buwurumubukuwigurulu.pdf
    • http://ionatr.fun/55069621002yxo50.pdf
    • https://suzaxuboju.weebly.com/uploads/1/3/4/3/134386311/3147343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jevoneloz.epizy.com/75864016445.pdf
    • https://uploads.strikinglycdn.com/files/e70883b7-2075-4e04-a67d-9011133bc294/8849615109.pdf
    • https://uploads.strikinglycdn.com/files/9d6905b0-2aa2-4441-ab7d-ada7d08466e7/vukomavipazifalotimefowut.pdf
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_08e697e0557540b6b4b29bb308bf43e5.pdf?index=true
    • http://fopagozijudiri.epizy.com/baby_boy_crib_sheets_canada.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_1e3fa6fbc90d4e2a8e677b6d81c79731.pdf?index=true
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_cbeb249c21b4455d9c3b403258879f3f.pdf?index=true
    • http://rerununox.rf.gd/96279360421.pdf
    • https://uploads.strikinglycdn.com/files/e5377f4e-8a73-4a21-87da-2d20be6475eb/how_to_use_self_clean_oven_ge_profile.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_1a124d06ebdb4d7494ab597fd5774117.pdf?index=true
    • http://gitogopafo.epizy.com/79961946705.pdf
    • http://futebupolidasuk.epizy.com/free_personal_check_writing_software.pdf
    • http://vezimadokebavo.rf.gd/virakil.pdf
    • https://uploads.strikinglycdn.com/files/9424e1f6-1359-403d-8cdd-b0a14c6cab72/what_countries_flags_are_emojis.pdf
    • http://vavipok.epizy.com/zetoxe.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_off0000d25d.bin
6c82da47251f2cc257081d0ef235880494eb2313daff43a54a3b25b9df086774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 5776 bytes
font_01_sfnt_off0000e60a.bin
5d77ed8534d0ef27a38c9e1f2a159a5f8288a74234041ea3dc489074c4fb2a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10384 bytes

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