Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0108b7e778abbe2…

MALICIOUS

PDF

79.2 KB Created: 2021-05-25 13:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef9b6c333b0143b15b0cfa0a9824682 SHA-1: 6ad7b6bb1ea930b393de34ba50387ddede5438bd SHA-256: a0108b7e778abbe28c435207247b074b3286272b1155d277b2c298efbb3e91c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating high maliciousness. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cdn-cms.f-static.net/uploads/4465003/normal_5fd7ec5f52399.pdf
    • https://cdn-cms.f-static.net/uploads/4416675/normal_60160b11aa65a.pdf
    • https://cdn-cms.f-static.net/uploads/4462065/normal_600b3945e5589.pdf
    • https://dukifuti.weebly.com/uploads/1/3/1/4/131437117/686255ccca731.pdf
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/gibosavagati-wigubugavojifov-rozijilaxugete-dojedeje.pdf
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/xofasotutovaza.pdf
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5fdea75974167.pdf
    • https://tejojobowadame.weebly.com/uploads/1/3/0/8/130874570/1200957.pdf
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/zemudexa.pdf
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5ff9b82f680af.pdf
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/gafuturujozapux_bizod_vodad_jikibujetoradig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=john%20deere%202140%20pto%20problems
    • https://uploads.strikinglycdn.com/files/2063bbec-ddfa-4dfc-9829-4782a1cbbe0c/20092427785.pdf
    • https://uploads.strikinglycdn.com/files/8fc9bb9e-5926-4842-ad52-a2184009059e/the_royal_ranger_book_4.pdf
    • https://uploads.strikinglycdn.com/files/f9ab891e-ccfc-406d-88cc-af2fcdad2016/73539626809.pdf
    • https://uploads.strikinglycdn.com/files/986ea657-8033-4be3-8955-d7912cf7ec09/masugozu.pdf
    • https://uploads.strikinglycdn.com/files/43434496-7aba-48d1-990c-adc30f64f066/82210468144.pdf
    • https://uploads.strikinglycdn.com/files/3488ae82-29e7-4c1f-ba84-23915228565a/our_god_saves_guitar_chords.pdf
    • https://uploads.strikinglycdn.com/files/520fde11-6254-4157-be43-a87a94c1a5fb/mopukebodovimameza.pdf
    • https://uploads.strikinglycdn.com/files/f9e37265-d813-4337-974b-efd38bd1916c/list_of_sdg_targets_and_indicators.pdf
    • https://uploads.strikinglycdn.com/files/caf78f0d-6a8f-4da0-bea2-718c388391cd/can_ps3_wired_controllers_work_on_ps4.pdf
    • https://uploads.strikinglycdn.com/files/41dcc4e6-7c6f-4e53-b02c-057faf26022d/90877125534.pdf
    • https://uploads.strikinglycdn.com/files/da53a814-5271-4280-b8a3-ad78b4ddb56f/69234110344.pdf
    • https://uploads.strikinglycdn.com/files/cbb7493c-3647-4ddb-9c1b-fd2b73ff8d94/best_buy_credit_card_620_credit_score.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_off0000f78a.bin
e4f31e9ea9069b38e51dc651d66fb7c0d81c32178afc7847a8bf0c3f9f9408b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5532 bytes
font_01_sfnt_off00010a2d.bin
3c8f76303cad50869509e8b0b13751e84e5debf2e5eae6c0a04f538f9219a0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10960 bytes

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