Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58aa6f8341b5d22…

MALICIOUS

PDF

80.6 KB Created: 2021-04-02 23:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1cd8ab5c98f601bb28ef80200eb1613d SHA-1: 2098d2717515f2b2fbb314993f2d449c63e71313 SHA-256: a58aa6f8341b5d221feed9b2ee2513a55165f3a0f9bdc3edf514499a48990ff7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+choose+wiper+blades+size PDF link annotation
    • http://torchland.xyz/935011182397u86f.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/drying_cereal_grains.pdfIn PDF document text
    • http://judejoz.iblogger.org/how_to_lose_fat_but_still_gain_muscle.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/zepom.pdfIn PDF document text
    • http://gebuzof.22web.org/english_speaking_course_free_download_in_urdu.pdfIn PDF document text
    • http://hookup666.site/goflex_home_installation_software_download72kus.pdfIn PDF document text
    • http://rumerijazafided.22web.org/asphalt_8_pc_ocean_of_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b6b67729d1884e01a110df674060ace0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/46088250222.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/mekovevarevufuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/hardloop_bouwer_bosch.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/rumble_fish_2_wiki.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_85df49606e56402e901c81c45c6ef1f2.pdf?index=trueIn PDF document text
    • http://dosusixajamatef.rf.gd/how_to_connect_mini_wireless_keyboard_to_firestick.pdfIn PDF document text
    • http://giratas.epizy.com/create_a_family_tree_template_in_word.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_8257a0656f2b4a0e9415a32232213f6d.pdf?index=trueIn 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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 5404 bytes
SHA-256: fc4049a6488993bc685e41f1f799bac4d0fa676c410e9b9777661c836e98f02a
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 11024 bytes
SHA-256: afb0496932552e44cc028cfd2d7d80491fc45d470bcbadd655df25627bf6f483

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