Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df9ae3b7b674706…

MALICIOUS

PDF

78.0 KB Created: 2021-03-22 05:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31a86be87a01de876de4a418566f86c3 SHA-1: 504da7ae74dbeb548441b5a6812c90cfea5344db SHA-256: 7df9ae3b7b674706cb39888f4bcd1fe7ef26eec4866488a4eb0904683304c90c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. The embedded URLs suggest an attempt to redirect the user to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=arkham+knight+100+guide
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/a8b8f9dac98f4.pdf
    • https://cdn.sqhk.co/jixuvepabu/chechic/89795411600.pdf
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/refokef_tikafixu_xopagerawo_ropiw.pdf
    • https://cdn.sqhk.co/murevexi/mOefF3R/60307789355.pdf
    • http://vibolofisef.mywebcommunity.org/best_primo_bottom_load_water_dispenser.pdf
    • http://nozatisesufi.scienceontheweb.net/bionote_halimbawa.pdf
    • https://cdn.sqhk.co/jasojime/hdKhigi/ronoxojipasojosezewodak.pdf
    • https://cdn.sqhk.co/vapatibu/y0ijijd/23132000307.pdf
    • https://vumerumub.weebly.com/uploads/1/3/4/6/134634189/284f1b2eb2e89.pdf
    • http://jolixasij.sportsontheweb.net/vocabulary_workshop_level_c_unit_12_synonyms_answer_key.pdf
    • http://xejepurefe.scienceontheweb.net/garmin_map_update_freezes.pdf
    • https://cdn.sqhk.co/dolavalof/GOVhehf/70213967132.pdf
    • http://bepelisufozasep.mywebcommunity.org/loronar_e-9_deck_plans.pdf
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/rofosirapovor-sogamores.pdf
    • http://vonexalux.sportsontheweb.net/what_causes_a_dryer_to_run_but_not_heat.pdf
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/pisasuzi.pdf
    • http://vimabanu.sportsontheweb.net/lightning_protection_methods.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_8cbafe812db7437ca1ccdbb2a3ce0041.pdf?index=true
    • https://uploads.strikinglycdn.com/files/42f6ec98-2051-4b93-9d01-0dea0745dc20/my_favorite_things_sound_of_music_ukulele_chords.pdf
    • https://uploads.strikinglycdn.com/files/438d8370-22bf-466a-aeb3-ef523a0b1b3a/pefomelurovoduge.pdf
    • https://uploads.strikinglycdn.com/files/da8bf86d-4616-4c92-a40f-539e1ce1ed1a/40475427591.pdf
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_75fcccc5cab94ec6b7ac88c69c2e862f.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_acafd85efbe34df2a567fe2d2b98baf9.pdf?index=true
    • http://gavofime.atwebpages.com/action_research_in_kannada.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_1a2c6a3123a247b990681eaf3d3d64f4.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_off0000f5de.bin
6ecb66b7dedb206bbb47a108b10b00a53471f3371c91f00b20f441ffbf94dd2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 5276 bytes
font_01_sfnt_off000107a8.bin
f5281975df830f0a7893c69ae195f15570aa048bd5ac3f99d3fe05f64f0e9864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 10192 bytes

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