Malicious PDF — malware analysis report

Static analysis result for SHA-256 07535ccd1d63066f…

MALICIOUS

PDF

101.5 KB Created: 2021-03-09 20:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 31024c0bb9464ab0ee881d24f4ba4528 SHA-1: dd59be5ee83a39893b0b4d5c51b7cfe878db85d1 SHA-256: 07535ccd1d63066fb359a21b1f6449a701aa3c33ab3d325684b7c73da491ca22
186 Risk Score

Malware Insights

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

The PDF file contains a lure related to popular media to entice users to click on an external URL. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate the PDF is part of a link farm designed to drive traffic to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the primary URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://xezojetit.ru/strik?utm_term=the+ancient+magus+bride+season+1+episode+3+english+sub PDF link annotation
    • https://cdn.sqhk.co/livaxipovage/eJ0vVjf/kabasinipof.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/cVidkvY/wechat_online_support.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/Hyyjazz/charades_ideas_for_adults_tv_shows.pdfIn PDF document text
    • http://wavepolabipal.22web.org/vezudipezawuwiri.pdfIn PDF document text
    • http://misirabul.22web.org/what_is_the_cheapest_roomba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_a904c39368814f39b12079505627ad0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2096fca9-60e5-4099-9bad-b1fa87ba1a09/vagumugazasiwagevubuwis.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/rutafoselafapibogimi.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/jitobanap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc261786-5508-413d-9056-c8a1e4590947/ancillary_justice_review_new_york_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de20b659-27a0-4c1c-bb10-fb7c2582662f/que_es_composicion_en_dibujo_artistico.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_e6f7aaafcfdd43d2bda60fc77559fee1.pdf?index=trueIn PDF document text
    • http://xikexugisomap.rf.gd/18382717812.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/menanisejenefijawatel.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_3b210f2a3beb462586519ec7c96fc4e1.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_c9a9ce2f4fb2484f8c85280290cf7f1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozetej/xinofaginiledudojavonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca30880d-4f39-4755-a499-51cf8b71a3c5/daniki.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_11ae615384304b619592481bc0095242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/sabertooth_990fx_r2.0_ram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81c070e-8e69-4f15-adf8-920ad4958390/wulemefefezapukoxez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1c2904-a921-4b8e-9bf2-acf077c9bd3d/3345177042.pdfIn PDF document text
    • http://vetozidute.rf.gd/83196544453.pdfIn PDF document text
    • http://bezetotosun.rf.gd/2000_honda_accord_transmission_fluid_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f493b08f-6531-48a0-a7a0-2a37f0fa7132/rexuvoraranug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad95a5bf-90f5-44b4-9894-aa7c551be800/que_es_regresion_lineal_en_estadistica.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 20548 bytes
SHA-256: a00f9eaa654ec55c578b9d91a2f3e450b2e322c971cd0bf50b59d8cc91cc0087
font_01_sfnt_off00014572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14572 5792 bytes
SHA-256: 3d6d95913105d57ffb5a78a38b6f65fb2b7327846561e67cbf6917f3230ab2b8
font_02_sfnt_off000158ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EC 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off0001617a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617A 11052 bytes
SHA-256: 09b33713e368709693943b2af22154bf2b19911642dd344f71c8a8501a70f2f7