Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bad201c71d0b70…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 22:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96bc230e310d5a8d368866456aa853e SHA-1: 566a5bfc04a6686590938f53df425c3124d03b40 SHA-256: 95bad201c71d0b70fe19fcdae05602198cbbe8aa6b6d957a7bd06b81ee0960c0
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crophysi.ru/strik?utm_term=the+maze+runner+book+critic+review
    • http://jekeluxuto.mywebcommunity.org/netafo.pdf
    • http://igcopyrightverify.com/gumukuw4oj4v.pdf
    • http://mokuduvejevuz.scienceontheweb.net/a_positive_blood_type_diet_food_list.pdf
    • http://strapslap.online/bob_marley_greatest_hits_album_downloaddrr6a.pdf
    • http://nitanupemil.mygamesonline.org/sight_words_sentences_worksheets.pdf
    • http://naturwows.space/ironplanet_wire_addressz4ozw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_82eb8a200120417c86e73b970aac2572.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f91c836cf68d459092692843659fead9.pdf?index=true
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_3b32414f9f7b4501b5de7bdac05751d5.pdf?index=true
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_a576e6f3381a4de484c007124c6b22ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9141898-6eb8-455c-ab81-0cb8286cb7a9/what_is_aisi_1040_steel.pdf
    • https://uploads.strikinglycdn.com/files/d3697ee4-b7b4-4c89-a191-1acfe31755f9/96060382395.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_ad1d9b376f964f9cba33fe601e40b892.pdf?index=true
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_f9c66797a2254c74b580ad0c6607758d.pdf?index=true
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_fd463d66fd1841aeba4e6eb075da961b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/243a8087-e2a0-43b7-a2e3-57206916c0f9/67239951833.pdf
    • https://uploads.strikinglycdn.com/files/2249c512-4e5d-4d99-9b7b-97e838e6477f/kekiwidorurijaz.pdf
    • https://uploads.strikinglycdn.com/files/5261a7e3-914e-46b0-a54e-00ffc5965387/94095292626.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_off0000f00c.bin
867252001057875155c069d1097ef1fe4ff97ad79b369ed64cc291f56b5a566a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5184 bytes
font_01_sfnt_off000101a0.bin
abaecf62f05c888f80891102f4ed11f44c2dc1b9dc98f3681cff34bdf68d7e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10980 bytes

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