Malicious PDF — malware analysis report

Static analysis result for SHA-256 5944dbd6da250328…

MALICIOUS

PDF

75.7 KB Created: 2021-05-29 04:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a4701e6ea038f844c17ac27ba75efa1e SHA-1: 2915619838836f4f167f943e42b142989834797a SHA-256: 5944dbd6da2503286af823333ad7c4e6e7f5e35d20642b9250d45800c33dd2ca
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a link farm. One of the embedded URIs, 'https://bologen.ru/strik?utm_term=how+to+play+fortnite+on+incompatible+devices', suggests a lure related to gaming. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea of a deceptive download prompt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=how+to+play+fortnite+on+incompatible+devices PDF link annotation
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/sojagod.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/sakoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601f6171620bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5fe36ddc9d943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_601bafeb9bdbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5fdc798863582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_604d112aa552c.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/be557b1d-c87e-4120-93ca-54c1f1050d03/art_a_brief_history_7th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ab839e-727c-4b4f-a566-6628c5c1baa9/lidizivegim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd6f36b9-ed0e-46ec-8ba5-8753b7e5943d/behringer_xenyx_x2442usb_manual_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff48f70-8c6c-403d-bd3c-097d655aa207/how_to_replace_a_trailer_wheel_bearing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcaedcf-2bb7-4edb-8615-4b7d7819e722/is_there_sales_tax_on_food_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd340c94-a0c6-4415-b845-2a1a81dc4f8d/how_to_write_a_good_review_restaurant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7409db-7413-408c-b693-c6ad3e6fa91a/volvo_penta_5.0_gxi_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f352a3a-5348-4068-bd63-7504be419567/what_is_discontinuity_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdb9c2f-fc6a-4bdd-bc0e-3bc4d9276323/13996203199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ec5078-2862-470c-af2e-4202e36a15df/wawebaved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfa7858-fdab-451d-aaed-6bc1e1ae98bd/list_of_important_collective_nouns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d447f93-93bf-4d20-ba34-86fd9b74bece/exact_trig_values_graphically_sine_and_cosine_calculator.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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 5656 bytes
SHA-256: ac08d89210064449d4664ba7a5fa79c6b5339ce1a5265c60a96394b4716534ba
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10892 bytes
SHA-256: b1a913d8df9f8ac803da4dac168dadcf908c706e134da819176ef0a27a148d15

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