Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a9cc507c045907…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 23:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4ab32452353e89ae5f933e0ff1d2054 SHA-1: 52dda7b5f2e0c085b8e21170ad9960fe23ae0256 SHA-256: 63a9cc507c045907a2e1af9e722fff5c31939a31b827365bb0069340d713c774
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic to redirect users to malicious sites like 'dafemum.ru' and 'jarowulizose.sportsontheweb.net'. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users through malicious links.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=son+lois+lowry+pdf+espa%25C3%25B1ol
    • http://jarowulizose.sportsontheweb.net/axis_allies_d_day_rules.pdf
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/3683800.pdf
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/59e1f4e478.pdf
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/nexidoxelerorogub.pdf
    • http://idealsit.fun/how_to_estimate_a_limit_graphically055wi.pdf
    • http://store50off.info/lebaran_tahun_2020_kapanb9m4j.pdf
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/meluredolobul.pdf
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/8603700.pdf
    • https://bufuduvo.weebly.com/uploads/1/3/0/8/130874305/lalegadiderediro.pdf
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/jubobe-dakotijo-fosatofeferiva.pdf
    • http://registrat.space/moxemipavitukigedumawew97ygb.pdf
    • http://my-favshopf.online/603799481651cb0z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e87f8af-8ae3-424b-86a1-2daf0b832072/how_to_adjust_draw_weight_on_bear_apprentice_2.pdf
    • https://uploads.strikinglycdn.com/files/ca0c7a81-4b96-4eed-87c0-d8a4935e0e53/kulifadupumifet.pdf
    • https://uploads.strikinglycdn.com/files/b69bbab1-e099-4444-9316-1dfeca74b876/gugasasa.pdf
    • http://tarepos.onlinewebshop.net/94186585191.pdf
    • https://uploads.strikinglycdn.com/files/0ce5c916-e5ce-4381-90f3-ccaf965df296/menoseziritevesebuk.pdf
    • https://uploads.strikinglycdn.com/files/18d334b8-5e91-4507-9e8d-a7edc4706a34/what_compares_or_shows_the_relationship_between_two_quantities.pdf
    • https://uploads.strikinglycdn.com/files/628d33da-e9a9-4060-ad66-7c1df36ff2ae/saranuregeroriziw.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_off0000ec53.bin
c490ca6019b470bd9c675be95f7fc13f21b21fc18b58d80a618f17adfa94a390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 5544 bytes
font_01_sfnt_off0000ff0f.bin
8666321cf57aff5e7c08d8cfd83068373ddf578f7c002ce99dcdfe07d68e5073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 12604 bytes

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