Malicious PDF — malware analysis report

Static analysis result for SHA-256 907dafa30a98c605…

MALICIOUS

PDF

96.1 KB Created: 2021-05-26 04:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d7f78aa8e5fb438f268c6de3e70657 SHA-1: 820d922505090be53af670232fa63c032e3e0a54 SHA-256: 907dafa30a98c6054af87a8fbed070477ffc92f402b1b135549239b5716ddf6c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://resalured.ru/strik?utm_term=how+can+you+make+lactic+acid+bacteria+at+home
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6056abcd72313.pdf
    • https://cdn-cms.f-static.net/uploads/4405929/normal_6026b0c2b092d.pdf
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/pilam.pdf
    • https://cdn-cms.f-static.net/uploads/4477156/normal_604cca624818c.pdf
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fca58e8d076f.pdf
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5ffb27d00e4a2.pdf
    • https://cdn-cms.f-static.net/uploads/4467043/normal_601a6fa464f9a.pdf
    • https://semizomemakov.weebly.com/uploads/1/3/0/7/130739936/2423784.pdf
    • https://cdn-cms.f-static.net/uploads/4479454/normal_600f9e0e2ac01.pdf
    • https://lisebozaran.weebly.com/uploads/1/3/4/6/134694889/jeguronap_rukikibovimar_lasasurop.pdf
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/e18b6781.pdf
    • https://cdn-cms.f-static.net/uploads/4389792/normal_6044755492c80.pdf
    • https://cdn-cms.f-static.net/uploads/4427274/normal_60417f5d2ae1e.pdf
    • https://cdn-cms.f-static.net/uploads/4426547/normal_6010aef75d1e1.pdf
    • https://cdn-cms.f-static.net/uploads/4413862/normal_604f565f3dadd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e3b202f3-3561-44fd-8d7b-435d335efc8a/buxavodup.pdf
    • https://uploads.strikinglycdn.com/files/ca81e50e-3e4e-4acf-8977-567bfae2ff95/81458204163.pdf
    • https://uploads.strikinglycdn.com/files/0faa1da9-c8cf-4304-ae6e-15bc59326b84/67766685972.pdf
    • https://uploads.strikinglycdn.com/files/f7b02f90-86ef-46ec-b5d2-2c5b6e63add3/albert_einstein_ber_die_atombombe.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_off00013b35.bin
3552d1937e01bd1e6bc0b051671765b2329215905cfed940ef378c225c7cfbc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 5360 bytes
font_01_sfnt_off00014d58.bin
4d8992ed8a70cbcdcc6a8a750311464ab74cd598d33604e0fb00829eb9fc9341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D58 11128 bytes

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