Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2372dc68b77e6d4…

MALICIOUS

PDF

67.6 KB Created: 2021-01-01 09:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 883463aa108984da64645338d7417fa3 SHA-1: 6d1108b4f3ba5fbba9c77387c011ee7a7c07058e SHA-256: a2372dc68b77e6d4c58748acdbf9970d1b31811d09e22e46d65cb4df7a235f29
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded links, such as 'https://traffine.ru/wb?keyword=counter%20strike%20online%202%20size', likely lead to phishing or malware distribution sites. The document body, though heavily obfuscated, contains text related to game downloads, suggesting a lure.

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://traffine.ru/wb?keyword=counter%20strike%20online%202%20size In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fd1ac87baf32.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/pabubogukogazo_jovufaj_mafikobela.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/rafukodurororik.pdfIn PDF document text
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/ec729aec08f.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/cxiaQA2/voicethread_tutorial_video.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/jhA5fFV/26216445431.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/3d233a25-94ea-4f81-a0d4-fcfaff2388ff/42809283760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4509a4f7-de5a-4d0e-b4c4-5b87a4f480a5/stalker_shadow_of_chernobyl_multiplayer_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f01e50-ed0a-4fa0-afde-9e9b22af2a46/trainwreck_amp_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbebada4-3b37-494a-b24a-1a8f7e02cacc/bl2_gibbed_codes_grenade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb0b03a-2b0b-43a2-b859-7235ca3b3b4f/town_of_claverack_tax_bills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f06c98-2327-41fc-a243-a6e0ea93a8a3/66187938975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3f4ec1-dbe6-4951-898e-4fe5a99cf1c6/59934337075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad244fe-acac-4882-b83c-dafda620bc1a/ceremony_by_leslie_marmon_silko_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3969d64-fcfc-4f72-9598-0b361ee3882d/imagine_big_terri_savelle_foy.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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 4620 bytes
SHA-256: 9e836493dc58fd4eaf289592ea81cc1e517e50a95f975ae2eed410e6d4a868ef
font_01_sfnt_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 18152 bytes
SHA-256: 82e04a94ee246ff09913d4e1bb06ce73071cec03846b1e518a556fde6dcef8d0

Open this report in the interactive analyzer, or submit your own file for analysis.