Malicious PDF — malware analysis report

Static analysis result for SHA-256 452b2dc403ec85ca…

MALICIOUS

PDF

76.6 KB Created: 2021-03-13 18:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c457f08dfe25147c918acff53e5577cc SHA-1: 457e6f249c1ebf51279fcecb4bec6f1ccb524450 SHA-256: 452b2dc403ec85caf8ed507281cefe092cc216dd7a22639f682faedf0d209bce
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to unrelated PDF documents, indicating a potential link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=clash+of+clans+raiding+strategy+th11
    • http://mikovil.mywebcommunity.org/dr_brown_microwave_steriliser_dimensions.pdf
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/lipudubuf-dazutesi-sekud.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_602292a465d6f.pdf
    • https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/4829382465b3683.pdf
    • http://letnesil.xyz/cristo_el_anarquistapkyf5.pdf
    • http://thelait.pro/kitchenaid_kcm1202ob_replacement_carafedqr8v.pdf
    • http://giwosoto.sportsontheweb.net/genie_powermax_1500_manual.pdf
    • https://venewosusi.weebly.com/uploads/1/3/1/3/131398385/0bf34e33d69.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/c1cc64427.pdf
    • https://cdn-cms.f-static.net/uploads/4413570/normal_604859cf7e8bf.pdf
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6021642bc8e99.pdf
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/5616789.pdf
    • http://nubatevujonuw.mygamesonline.org/88756042119.pdf
    • http://toppiksnack.xyz/osha_forklift_training_videor3fkf.pdf
    • http://vipmanmarket.space/maple_leaf_rag_sheet_musicshivx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pilazi/bollywood_song_video_wapking.pdf
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_884565fa2afe4d4ba1cac54b61e35319.pdf?index=true
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_8294dca3213042a6a13d67c1989e2a5a.pdf?index=true
    • https://s3.amazonaws.com/nosepevozux/city_quiz_answers_level_10.pdf
    • https://s3.amazonaws.com/tugabijenovili/phrasal_verbs_exercises_with_answers_advanced.pdf
    • http://torejejowomu.myartsonline.com/john_deere_js30_carburetor_removal.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_561d5c0d05cf4b3a89b2b7e28dc5fe43.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/54545090272.pdf
    • https://s3.amazonaws.com/sisaxu/why_is_the_era_called_age_of_reason.pdf
    • 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_off0000eb58.bin
bb9accf66f62b621375ae2d4694ff6ac4cad27067f16c9341dec3cd408b8565b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 5344 bytes
font_01_sfnt_off0000fd88.bin
d64c1a612deb77a07125b7fbdf432a08750acc346fbe3eec0274d30db162c0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 11600 bytes

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