Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90d7cf5df14e51a…

MALICIOUS

PDF

88.7 KB Created: 2021-03-30 22:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 27c6fa5e2f88c67e11d7d9245c7f9b45 SHA-1: 2e87d6ac7b6423bd190d213bc650e36aebbb91ec SHA-256: d90d7cf5df14e51a7df4a3c04c1bb1d5643a6db2247743b8b3b577eca6e4fdca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=troy+bilt+super+tomahawk+chipper+shredder+8hp+manual', are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=troy+bilt+super+tomahawk+chipper+shredder+8hp+manual PDF link annotation
    • http://wutomomar.22web.org/the_land_of_stories_wishing_spell_movie_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/ShmQmid/happy_hop_kawaii_jump_hack_apk.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/6844975.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/BhijiHB/lerulikofamoge.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/8266343.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/iWLAKD4/xusuvifatav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_12d34e72a0c745d383c63c35fdf4b3f6.pdf?index=trueIn PDF document text
    • http://giwaseluje.rf.gd/capteur_de_proximit_inductif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a832107f-3a75-4d9c-8703-ea3b7f7728d4/dapepimufubobirugirudaji.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_0013896b1952415898084ea5a5649455.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ab0bb6-b23b-433f-8386-92453f32c813/wimefutinibubibewawalud.pdfIn PDF document text
    • http://lujifub.epizy.com/43401942281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f029fb-57b4-41ba-8b58-44b69ca34943/barodasetajakibif.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_7cfb6340713b423f95a21a951d0dcbc7.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_1f212748a58948af966f2f4301e74308.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_143fbdf7b4dd435396336ee38e8f6b3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cc7d14-be3a-4719-8841-53497587df63/oreck_air_purifier_truman_cell_replacement.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_9f9f9ea0743340ca95694840b1d4faf8.pdf?index=trueIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_8681b7e2b74b4459bce66b88dd751c4d.pdf?index=trueIn 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_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 5856 bytes
SHA-256: d67bdc1167efdf3e62c0a267ea058c5c34f96ecae67306e9874bf361db267200
font_01_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 11744 bytes
SHA-256: 8d2ff3761aaa190d344c0b7b75a0c82cbb20ec85a6930b5cf6c150fc50edd582