Malicious PDF — malware analysis report

Static analysis result for SHA-256 f674c8a3413801d5…

MALICIOUS

PDF

84.1 KB Created: 2021-06-04 10:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 58ac7a10ebfcce5fb361cb3e496f463b SHA-1: ce55bf860b68e8946b5cc7106718d122b279dfc0 SHA-256: f674c8a3413801d536449d0bce055abcfa30a21ad1ff2a4b2760c86625b396df
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The primary malicious URL, https://coretry.ru/pbw?utm_term=god+of+war+apk+obb+download+android, suggests a lure for downloading game software, likely to distribute malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/pbw?utm_term=god+of+war+apk+obb+download+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446382/normal_604f5653a2a76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476767/normal_5fc812875f20d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_6020cc76ecb30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365612/normal_5ffd050433bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5fdabd8276871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5fff6b86371c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413715/66302139558.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/borg_warner_t5_fluid_capacity.pdfIn PDF document text
    • http://mejigulo.pbworks.com/f/quando_prendere_il_magnesio.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/f/how_many_grams_is_6_cups_of_powdered_sugar.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419811/33950624282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdd069a-c25c-4c88-9dd4-c2b7758f0e40/subway_menu_prices_philippines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b26a30-3f1a-426d-88fb-2a81fe2b0db5/what_does_playing_cards_mean_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1651d7-1cca-4f34-9c35-f049c21fc2de/whirlpool_ro_system_wher25_manual.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144499821/download_game_ark_survival_evolved_android_mod_apk.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144467577/polaris_rzr_xp_4_1000_service_manual.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/31231315294.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144593067/what_are_the_hand_signs_for_fire_style_fireball_jutsu.pdfIn PDF document text
    • http://sejiliki.pbworks.com/f/how_do_you_write_a_good_reference_for_an_employee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb589f81-f8d4-4bd8-add2-025ce4a606ee/10143554507.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/nintendo_3ds_emulator_apk_for_pc.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144596883/13110279402.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 2888 bytes
SHA-256: f5ffd33d819fef3bbaa14510ee4901058a8837130854b1a5958ee82851db0796
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5184 bytes
SHA-256: c2f993d9440e3e05ed2ab36d6b25edefd9ce59a59619769eb29372ea92ffe2ce
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10912 bytes
SHA-256: 91f24887beb8dba93910737b36716f4b28583210923ddaaeb09c225fa60c7580
font_03_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67