Malicious PDF — malware analysis report

Static analysis result for SHA-256 977be49f62ee6279…

MALICIOUS

PDF

75.9 KB Created: 2021-02-04 19:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 929dda8e85d7da594edcb5b88e6d190f SHA-1: 35db5bbf5eab95a6f902fa3cf9761bc1199190cc SHA-256: 977be49f62ee627999c39315f0f26854b9a9da8e20dc2d771abb6c0c5f9fa9b9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

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://baarspo.ru/wb?keyword=project%20schedule%20template%20excel%20free PDF link annotation
    • https://cdn.sqhk.co/gofelaxes/Kgegefl/yellow_jacket_vs_wasp_sting.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/7bdd2c8346.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/zejoriranux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_5fd9f5b097ed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fecef630ee02.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/5CiaLLc/physics_class_9_chapter_1.pdfIn PDF document text
    • http://winokuzovew.iblogger.org/metformin_for_pcos_ovulation.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/hfcYjii/huawei_health_app_not_working_on_samsung_s10.pdfIn PDF document text
    • http://levupag.22web.org/brownian_movement_2010_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_600ef97943c16.pdfIn PDF document text
    • https://sagedawigaput.weebly.com/uploads/1/3/4/3/134336778/72416e0f2c8f.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/3ec8a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://babijegogaluz.epizy.com/sowabetaseseziluponikilu.pdfIn PDF document text
    • http://buzuxujov.epizy.com/kobifawikala.pdfIn PDF document text
    • http://sidovarodefomi.rf.gd/angry_birds_epic_pc_game_free.pdfIn PDF document text
    • http://jalameki.epizy.com/aetna_medical_claim_appeal_form.pdfIn PDF document text
    • http://gagutaxu.rf.gd/bluestacks_for_windows_7_latest_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 5268 bytes
SHA-256: 2836523b0d4804b10ac12c2287605df34defec8120e287cea4a388b812394b05
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10060 bytes
SHA-256: 66ed2c2954d0d76bdbd81780e590598b4bb0a457093f52930617c2892a9fa9dd
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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