Malicious PDF — malware analysis report

Static analysis result for SHA-256 31232240f0c50c0b…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 15:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75254583d2448c30b3815024a866327f SHA-1: 72fbe017d8227ae3ef0825dcf9c3d5a7af42e6a1 SHA-256: 31232240f0c50c0b65d73e7443ca6cbff80f7c457b2805d326a3ff81583035de
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

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://botokaw.ru/strik?utm_term=manual+camera+canon+powershot+sx510+hs
    • https://cdn.sqhk.co/lerapuraroke/agjgdgg/wolegu.pdf
    • http://ukrinsure.com/giwigarazovivulirigok6w2dk.pdf
    • https://cdn.sqhk.co/jifegusewe/QtibHi0/among_us_emergency_meeting_sound_roblox_id.pdf
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/6705507.pdf
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/butivakonasif_dofoxizaxono.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/mupuxa.pdf
    • http://cashthe.ru/ribatanewemoo0zn8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0fe8901b-cf6b-42df-8d28-2321133dddcd/4840353590.pdf
    • https://uploads.strikinglycdn.com/files/e3120d94-b0cc-4673-ad41-16ef9b3e549e/29783655861.pdf
    • https://uploads.strikinglycdn.com/files/366239df-c67b-47af-8a53-ae4c868819d1/shimano_di2_junction_box.pdf
    • https://uploads.strikinglycdn.com/files/77e82abc-7380-4482-ae03-d4886a6f7a16/magopotumun.pdf
    • https://uploads.strikinglycdn.com/files/4ba3dd4e-c035-4a9e-9517-c598c937292f/international_marketing_group_usa.pdf
    • https://uploads.strikinglycdn.com/files/867626be-32d3-4f0d-88e5-e4697325d7fa/definition_of_1st_estate.pdf
    • https://uploads.strikinglycdn.com/files/dbb87433-f2d4-4a49-be62-9083ff4a1be0/34897124041.pdf
    • https://uploads.strikinglycdn.com/files/810b7453-0d83-49e1-beec-b0ff53cc06ed/trimble_tsc2_antenna.pdf
    • https://uploads.strikinglycdn.com/files/4c25414e-4e43-43b9-be3c-1b868638f550/voxevifitagawig.pdf
    • https://uploads.strikinglycdn.com/files/f9a6d967-5fc5-4bae-bf37-0e98d508025f/mevunuwaku.pdf
    • https://uploads.strikinglycdn.com/files/e00bf9b0-f89d-412c-a4dd-5adc7c552627/2006_chevy_malibu_repair_manual_download.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_off0000edef.bin
e5f6c7f591530e426ef3822c7e40934bc2c70aa39d69c343bb35f72aade059a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 5656 bytes
font_01_sfnt_off00010128.bin
1f51e32bf38ab8a7ef8e823aefa9699b8a7e4ebd106b21e03f3844aeafd1f680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 10932 bytes

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