Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b5214752d7d9e7…

MALICIOUS

PDF

80.0 KB Created: 2021-03-19 06:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d94d7055b5cb8949ab02347eaa71c1f SHA-1: 7023d2e215da35bee0c3665d6967f5f7fef15b3e SHA-256: b5b5214752d7d9e716841ea467ad52990ce142d785d418855af7d7ac99af6b3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant heuristic firing indicating a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'calculus books'. The presence of external URIs and a high ML score strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=best+calculus+books+pdf
    • http://gonakasuzoze.22web.org/70663696793.pdf
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600bd844040e8.pdf
    • https://static.s123-cdn-static.com/uploads/4486374/normal_5ffb9974b3e96.pdf
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/a5ed6fe.pdf
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/pekiputipiseso_sekasiwomi_tevuxatije.pdf
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/pedipu.pdf
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/jekemivusukusonogi.pdf
    • https://cdn-cms.f-static.net/uploads/4500893/normal_604d80b0610d8.pdf
    • https://cdn-cms.f-static.net/uploads/4417032/normal_600c78cfd4a9b.pdf
    • http://kadabafomelu.66ghz.com/minecraft_skin_java.pdf
    • https://cdn-cms.f-static.net/uploads/4401519/normal_5fdc6e4765092.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67479146-0909-4779-9853-c38982f71137/kenmore_he4_dryer_repair_manual.pdf
    • https://s3.amazonaws.com/gixirojozogufux/water_soluble_fertilizers_in_india.pdf
    • https://uploads.strikinglycdn.com/files/57adb6d7-6652-40a7-a350-286299a37561/how_much_does_an_osha_30_class_cost.pdf
    • https://uploads.strikinglycdn.com/files/1ce8fd8b-ce0a-483a-b6b6-f44cfc973f30/the_maze_of_bones_by_rick_riordan.pdf
    • https://uploads.strikinglycdn.com/files/75773e29-5caa-480f-a61b-3f4009c34873/78354552864.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/cal_osha_violence_in_the_workplace_reporting.pdf
    • http://tapopopabe.rf.gd/zasuvosupizasilugoxop.pdf
    • http://zofabag.rf.gd/69995583564.pdf
    • http://lisotabisalak.epizy.com/32265561349.pdf
    • http://bowetuxamu.rf.gd/mathematics_education_research_topics.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_off0000f7fc.bin
bc0fce8d973c8395f50ba02ba50d70629b59d6e8ba90fbb6756229c3af427fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 5304 bytes
font_01_sfnt_off00010a1f.bin
dd521eaa155db4ac02078ca3f202e70259c19111397f1ce9045adb6407c36445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 12024 bytes

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