Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d388878fa90f46…

MALICIOUS

PDF

70.6 KB Created: 2021-03-11 14:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb5860e78927a4f056cba030eaef1ee0 SHA-1: a91cced896ec1c9e5773dc21fb0fdcbb88884c75 SHA-256: f8d388878fa90f4690588b89764a890a3f950c80cfc153151e9a38fbfd327c88
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and potentially malicious content. The document body, though heavily obfuscated, contains text related to downloading a PDF, suggesting a lure for further malicious activity.

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://gimoguvi.ru/award?keyword=cracking+the+code+3rd+edition+pdf+download PDF link annotation
    • https://cdn.sqhk.co/dagedazi/vSAhjbD/79092495719.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jd0OHzM/super_mario_run_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rogokivika/hFifgcI/vixadakozebaz.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/35jhgiP/legiwirisejejuxitoz.pdfIn PDF document text
    • http://shop50off.info/biology_genetics_test_review_answer_key62k7n.pdfIn PDF document text
    • http://apelsins.space/76643814211sgk5l.pdfIn PDF document text
    • http://kupivse.xyz/93940748225oqjwg.pdfIn PDF document text
    • https://cdn.sqhk.co/ladatiziz/Hjeechg/zugodojijodokidubuxogi.pdfIn PDF document text
    • http://j3vnci4.xyz/kadilerelinomefkk4pl.pdfIn PDF document text
    • http://raisinshq.pro/bncc_ciencias_naturais5bvco.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0a3d03-f1f5-426c-a691-8cdd08f940ae/m50_gas_mask_accessory_pouch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb32ccaf-d171-4cd1-a301-805317f2826c/western_digital_my_passport_ultra_fr_mac_4tb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcce2f6b-391e-4c65-a8ec-ab8efba1be4c/what_does_a_godfather_get_his_godchild.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/lutafiwolupamado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351a3712-8a72-4a66-a379-c7ddfdbbb299/dinoxuniwipoxulatobedozov.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/fibuta.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/azur_lane_akashi_equipment_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3fcbf7-ac86-4dc1-a4e3-4041bc9356d4/mapuzofoxeberudil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16992694-8d23-4592-9d40-c62a20056247/gatajudawefobuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d074fa-7e06-41ba-a898-c236ea712765/skyjack_sj3219_specs.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 5464 bytes
SHA-256: f6b2e8acbdb054dcfe91e4a1eab9e5ad8583e3f948ddacf0a2463ce4907324d2
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10140 bytes
SHA-256: 7db00ab0e0ea43c3da66e0c3dc21a13558e6c56f37a904861f3f8c61cc6f3e6d

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