Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f7f90299befabd…

MALICIOUS

PDF

80.7 KB Created: 2021-03-07 10:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 14db9dd2a0701bfe1ff83c26a90b2efd SHA-1: 13587cd67901e105b33b8b88949c9a01d0a2aa1e SHA-256: a0f7f90299befabd77f7cf9943558cb51d774e9695d3306eaf0a1b5276330887
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing a malicious redirector link and a link farm. The embedded URLs, particularly the one pointing to 'dafemum.ru', are likely intended to lead users to phishing or malware distribution sites. The document body, though heavily corrupted, contains fragments suggesting a lure related to game cheats, which is consistent with the malicious redirector URL.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=how+to+spawn+a+lamborghini+in+gta+5+cheat+xbox+360 In PDF document text
    • https://cdn.sqhk.co/wusakituzu/hcgfUgc/gold_rope_wine_bottle_holder.pdfIn PDF document text
    • https://cdn.sqhk.co/xafigozenusu/U2rYhb0/paleo_diet_breakdown.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwatipo/9xhhAKj/28565058730.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/BDpohio/download_stickman_rope_hero_mod_apk_android_1.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
    • https://uploads.strikinglycdn.com/files/bd02ce3e-6b8a-49ea-810d-ab5e34154e23/what_is_the_horsepower_of_a_4.3_mercruiser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d767df-52bb-4d04-8afb-3d03efe77026/seth_abner_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4112dda2-1f5c-467f-856d-b8a4fc6030b7/excel_vba_function_return_workbook_object.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63dc87e-6d9f-46de-b393-3b3532229e83/will_gta_6_work_on_ps4.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_776d1cba5a9a4e6699f5a672ac2d7eeb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5dffefe-fb69-4dbf-976f-748ced85334e/free_electric_pressure_cooker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e457cb-fe9d-4b16-8d1c-423a40451f82/down_the_rabbit_hole_book_peter_abrahams.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_43bd9157b49a4f0e910df9209d38063c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/tajesadorepiluluda.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/ximilufuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c48e98-5afa-4fe0-986f-fccd0d09fc18/george_foreman_indoor_outdoor_grill_top.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_0f4ac2639dc74b41ae311d707349f3b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/modal_auxiliary_verb_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/chatbot_website_template.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_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 5980 bytes
SHA-256: ed562f33bcb95776dbb763965e45a9d4775869965c65f048d082763b06e8b9e2
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10672 bytes
SHA-256: d989609bb2e6ee6024f70759859568742630b08d592c5a3db175febf5f354067
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3