Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d8951712dab776…

MALICIOUS

PDF

76.1 KB Created: 2021-03-26 09:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992863c0e6f442935fcd286ccc4420f7 SHA-1: 70808ee634897f05bbd879129fa94bc7b55e66a3 SHA-256: c7d8951712dab776716997fdafcea39a45862dd1707e038dbf2179087b85ca76
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded JavaScript, though not fully analyzed here, further supports the possibility of malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=printable+address+book+pdf
    • http://bezprovodov.guru/statistics_101gmtok.pdf
    • http://gk-kuban.ru/elias_oraba_letraki6f9.pdf
    • https://cdn-cms.f-static.net/uploads/4423171/normal_60384ead291f3.pdf
    • http://feelslike35.com/rugby_world_cup_2019_fixtures_download_printable0hzit.pdf
    • http://urolog.xyz/night_owl_optics_3x42mm_night_vision_binocularkrp6e.pdf
    • https://cdn-cms.f-static.net/uploads/4388422/normal_600f59ea3c1b4.pdf
    • https://static.s123-cdn-static.com/uploads/4496571/normal_60031b07c84ab.pdf
    • http://50offstore.info/homedics_cool_mist_ultrasonic_humidifier_how_to_cleans3hf8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/443c12f9-950c-44a4-a14a-835aa6b8a27c/bodyweight_exercises_for_toned_arms.pdf
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_c38c8e2585af47ffba11e64bc77ab21a.pdf?index=true
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_24d5b38c5fb34853b10a2e3897ef662a.pdf?index=true
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_76b63e7a4cee46dbb11dc447c3c5ec84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a07205e8-4c1e-4faa-9825-5554f49e94e2/how_many_carbs_does_panda_express_mushroom_chicken_have.pdf
    • https://uploads.strikinglycdn.com/files/9e004190-3467-45e5-81d9-079580fa86e9/89583083391.pdf
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_68109e1f8bd1400f83e3782eb4d4c975.pdf?index=true
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_f003d4b2aaa34140b131f91e453bcbe9.pdf?index=true
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_4904ab0ba85540e0bcdc17d85d7af251.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_ee32047f319b4b1fa31dbf41ca0d4f81.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_off0000eda5.bin
ba911032b2e3abeceb57681d1880d98f1be5b795de6fe2bf3b794cc7ad9cdde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 5240 bytes
font_01_sfnt_off0000ff75.bin
0111de07854af8cebdd16654170193c6fa834a6fd262b4dd35142d01fec8edf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10532 bytes

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