Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b46cd7634ca66…

MALICIOUS

PDF

76.7 KB Created: 2021-05-01 06:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57a6d432d25586ee24fb98b086b9fdeb SHA-1: 51f72a863cd4977dd2e3ab00c35d227b4b82f220 SHA-256: 821b46cd7634ca6600cb82d84f0b175fb4f547d471ffc9d4408c54010dbe4756
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, appears to contain keywords related to search engine optimization, suggesting an attempt to disguise malicious links within seemingly legitimate content.

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-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://xezojetit.ru/strik?utm_term=harman+pellet+stove+dealers+in+new+hampshire
    • http://milanomoda-italy.website/harry_potter_8_movie_caste866h.pdf
    • http://shopwithsale.website/22430512091s8ye8.pdf
    • http://zakomuxoza.getenjoyment.net/13076750032.pdf
    • http://bawazofo.getenjoyment.net/mogarav.pdf
    • http://tonemisi.medianewsonline.com/university_english_vocabulary_list.pdf
    • http://good-production9.site/asociacion_protectora_de_animalesayfc3.pdf
    • http://pegejoruvufiron.sportsontheweb.net/inc_syllabus_for_post_basic_bsc_nursing.pdf
    • http://aires.fun/xipaxepovetekojarazew8ecyy.pdf
    • http://copyright-services-us.com/gunazepulijauoo5v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_86a200c4daf24d15a60fe4afba6620a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/719ded75-084d-4307-b853-472689b13d97/67232820136.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_37b2379179424fa5bb914e8c5a991814.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_f9bd9903e0a64b2ca8bd6252f0d0b0ac.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_71c4a72016d2418ca2e637ee9979a127.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59bc45a6-495d-463b-9b9c-3d72cec607de/what_is_the_military_discount_at_medieval_times.pdf
    • https://uploads.strikinglycdn.com/files/0aedde5e-8516-4ddd-8890-5de77bbac1cc/88626976016.pdf
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_134076e704ab44a193cdb5c8af7fea15.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d28b5ee9-63aa-45b3-b813-62bca56e72e7/bipadexopuzilezexezo.pdf
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_052f6d0d6dac4936bf6cb7b1d7f731ec.pdf?index=true
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_9eda6395273241dbaa8b2b4c092b5e30.pdf?index=true
    • https://uploads.strikinglycdn.com/files/22579222-6592-4c6b-a6c5-b3cc5a1e1c42/fetakopijiduzamemov.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_off0000ee92.bin
f00f0845e66696254f39f93386a885c857698a2e9300ba2b431a174ee108b0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 5312 bytes
font_01_sfnt_off00010082.bin
f1807ff96263ab1317be0a26e1579f569275557bdef63857fa8155852e9e1c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10744 bytes

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