Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d842d2c4c6680c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-25 01:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3db254ab3b515569a15038c831dd6f65 SHA-1: f6de490ea22caa9c89229264fd2b81ae40286952 SHA-256: 52d842d2c4c6680c6f2bc01ce5cb362194f23445fb8e530ed2bec3a1ce8da3c7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://mezovuduw.ru/strik', is suspicious and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=organizational+culture+refers+to+a+pattern+of+shared+beliefs PDF link annotation
    • https://cdn.sqhk.co/wogefosa/uhhtggO/63920282002.pdfIn PDF document text
    • http://wonder-ita.fun/68455933413vlp90.pdfIn PDF document text
    • http://ginumon.iblogger.org/telugu_chalo_dj_remix_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8OjE3nl/47006539138.pdfIn PDF document text
    • http://podenepusow.22web.org/33765176803.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/sanopujumexagiwavno8s.pdfIn PDF document text
    • http://blablablacar.online/60608419355o7mj.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/5h6hhhh/dragon_tattoo_hd_images_free_download.pdfIn PDF document text
    • http://vakexuk.22web.org/saucony_guide_iso_solereview.pdfIn PDF document text
    • http://rasprodavaika.ru/benim_hocam_corafya_genel_tekrar_20d5h93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zewimu/29845740768.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/87449752985.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_498205b191254c4fbb4aab434b348168.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_a8be62bc5ea046e098d5c973f945e124.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/how_to_be_a_christian_youth_leader.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_9663605e695440cfab9ef3af5a56c682.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_0d5ccc0fdf7b4b2b8f3e125ddef2e92a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/canon_eos_m3_manual_svenska.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_35436a3e9e3742d4be9d6a03d099f475.pdf?index=trueIn PDF document text
    • http://gekekenam.rf.gd/vakubakil.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_02b09d13815b48268dbb0f1703a207b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/audi_a6_avant_2016_manual.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_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5636 bytes
SHA-256: 95c3f9fd1d608db7756de0e4adce47ffe17fdcf06defa385c1425c55a25d78fc
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 10724 bytes
SHA-256: 607dd7bbae9867aab1ff5b448770eb0e72b51c20005b4cc01c61a1bae0930508

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