Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58eec6b7da04162…

MALICIOUS

PDF

86.2 KB Created: 2021-03-22 21:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4b96b1714e5477980d3abc74b05e05c2 SHA-1: 21c1056aedb35d13d6f6abdbdff0ab1e1e830703 SHA-256: c58eec6b7da04162a1dc4a0a6e85992cde48f9737f903be9ca1e804aaa34d156
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or phishing campaign designed to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to guitar licks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=what+makes+a+guitar+lick PDF link annotation
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/jadelefojegar_fewomukovi_tanujo_foguwajakod.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/46703506734.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/LRhfxje/xunugebatobenupanogor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fc88bcc3f38f.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/emotions_vocabulary_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/ichcRI6/minecraft_earth_server_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/gcgijjf/xafimikakazoraxofiwixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_603b53afadadc.pdfIn PDF document text
    • http://kajipim.mypressonline.com/abnormal_psychology_ronald_j_comer.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/fesifuwefe_loladonum.pdfIn PDF document text
    • https://jiwumakot.weebly.com/uploads/1/3/4/2/134235931/2767915.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/mieheib/the_walking_dead_season_4_episode_1_cast.pdfIn PDF document text
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/juzajawosezafuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_3d14cd9754cd4be989fc60916724e6ad.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_27818a80be57486da77f133c5a773592.pdf?index=trueIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_a58b38c001604f1686f50d8ff19f71d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba19e78-3371-4657-893e-6cabcc07c958/ladipukasanutuwajoxuvex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f2e0b6-5ab5-422b-aa3b-31bbebcbe44d/lagajexolofivega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8362005a-fbd7-47e9-88df-9807bd60d8aa/nipavi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 4956 bytes
SHA-256: 327322d1a11a84d529017d60e5d93626947eab2a5771166ec5b7ba49ba4ff91f
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 10744 bytes
SHA-256: 447385611bfa3ac6577088a16b168bef0d5389ece163cb042f33f8475270a740
font_02_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 16120 bytes
SHA-256: fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd
font_03_sfnt_off00013b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B98 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34