Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cd995465da54e9…

MALICIOUS

PDF

84.8 KB Created: 2021-03-28 07:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e866209db8a52e97161572133dd7032 SHA-1: 25df1cc478bc728fff556ce0bb5f2a7dd5a17402 SHA-256: f1cd995465da54e91291ae5824959b57149a77eae5b12d74c2a40ac909698318
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to domains like 'jumiwimov.ru' and 'antonioit.space'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=action+photoshop+vintage
    • http://antonioit.space/88566457661ebew0.pdf
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/3961253.pdf
    • http://grinallex.shop/exterior_design_in_architecture_yoshinobu_ashihara90nze.pdf
    • https://cdn-cms.f-static.net/uploads/4490140/normal_6018af2d55d3e.pdf
    • http://mivetys.xyz/philosophical_foundation_of_early_childhood_educationhwkn6.pdf
    • https://cdn-cms.f-static.net/uploads/4380525/normal_605656afe1915.pdf
    • https://zosafuwevuki.weebly.com/uploads/1/3/4/5/134524468/kelogebofenumo.pdf
    • https://datedafobegab.weebly.com/uploads/1/3/5/9/135990096/sofowutuki.pdf
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff6add2bb012.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_60267bea4f44a.pdf
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/edce1ad22e.pdf
    • https://cdn-cms.f-static.net/uploads/4473375/normal_603e3cdecdf68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c3a206e-f550-4536-b66a-6c0f3ab35653/52432037533.pdf
    • https://uploads.strikinglycdn.com/files/e69d479a-c0a1-4a05-8a4e-cc7cf7ffc3c3/the_jewish_phenomenon_summary.pdf
    • https://uploads.strikinglycdn.com/files/885b663c-90f1-4fc5-96ff-597f8020b2a6/mesuvaxetek.pdf
    • https://uploads.strikinglycdn.com/files/d45b5398-f95a-4fc5-a520-126e11cdb413/how_to_replace_whirlpool_refrigerator_light.pdf
    • https://uploads.strikinglycdn.com/files/48715c0f-469c-4f13-bb8e-8bf28d1f54cb/popogix.pdf
    • https://uploads.strikinglycdn.com/files/7e29ca14-191f-4fc6-a481-69c2e267048f/cuales_fueron_los_paises_que_invirtieron_mas_en_mexico_wikipedia.pdf
    • https://uploads.strikinglycdn.com/files/35cf7114-f3ff-49ee-ad21-e86ebb587a54/how_to_fix_samsung_led_tv_vertical_lines.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_off0001104d.bin
31372bc5607c7893afe62b946f7d95a1aafdeb72ef567033fa227cdd50ba04a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 5116 bytes
font_01_sfnt_off000121c2.bin
1971a41e40b1a62b3d4a188dc43ff849251abb0b9c1bd9a354bc73cdd0e39e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 10600 bytes

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