Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e81d844a2c5a9d0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 10:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b85eb0d07a48a3ee7fefc36f82c0ad SHA-1: 7b6923df80bdaba8d9d0c315e8d45fa4bc8c97bc SHA-256: 2e81d844a2c5a9d03909a22d67004fa5e93df0d37fc4a37bf3c6b7d6d697f474
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a lure for 'letter of resignation template south africa'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=letter+of+resignation+template+south+africa
    • http://fefevulo.22web.org/beirut_map.pdf
    • http://leafester.online/25078341834nnyie.pdf
    • http://rorabuvarumezip.22web.org/what_are_the_responsibilities_of_a_front_of_house_manager.pdf
    • http://hookup153.site/barnett_vortex_compound_bow_19-45_lbugxo0.pdf
    • http://jixaravaxagisuf.22web.org/giwex.pdf
    • http://zhk-samolet-krasnodar.info/logitech_m325_bluetooth_verbinden6k5xz.pdf
    • http://datifuxevewa.22web.org/crazy_rich_asians_movie_vs_book.pdf
    • http://jobware.pro/vajefigaxezovoduvosopez4d6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zufaxepixiguxax/personality_types_myers_briggs_explained.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_a207bee4c4ea43a788c6ce5c242da1ab.pdf?index=true
    • http://lunobejol.rf.gd/87666587166.pdf
    • https://s3.amazonaws.com/xupovobejanam/cgs_full_form_in_chemistry.pdf
    • https://uploads.strikinglycdn.com/files/58cf0e4d-fdf1-4cfd-b2c7-dfcaadc5a709/68395309247.pdf
    • https://s3.amazonaws.com/baposivarabuj/soditexuvasupokekiruxamu.pdf
    • https://uploads.strikinglycdn.com/files/f7225f66-70a2-4bc5-a038-acea672ce6a5/nelemopedixexedi.pdf
    • https://uploads.strikinglycdn.com/files/6e0e54e3-4841-4817-8e0c-bf06cfd4aa15/24945251333.pdf
    • https://s3.amazonaws.com/fazujo/baixar_arquivo_iphone.pdf
    • https://uploads.strikinglycdn.com/files/5ac3f099-39e3-4c35-91df-3d6a6b5383dd/vosowesugi.pdf
    • http://gimanumaju.epizy.com/python_examples.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_2b5eeb7824494fff9e3b0155bdf80313.pdf?index=true
    • http://notalopelovawu.epizy.com/80136120639.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_f611d8c434ce4aaabd1208560a40c21f.pdf?index=true
    • 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_off0000f213.bin
831df04010cb6d3ee09664a4f56ab45802126646c3b2ab3f802149b2fe61fbfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 5372 bytes
font_01_sfnt_off00010434.bin
8e5e072ad8b83e43009b049f764c1c75a4ceb8dcf2d319ad1c3be73e5c9ec2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10740 bytes

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