Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bafa2d08a4b173…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 14:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b0de4f153559c6535f581596d1f9dad SHA-1: e5d304ec1057dd04ca8df2c8ff17b7dceef35eee SHA-256: 22bafa2d08a4b1731b24d1aa94c447537b5e7104d6174f53cc2507c7f756b7db
186 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 hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=are+ryobi+power+tools+any+good
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/9076624.pdf
    • https://cdn.sqhk.co/tadeketoxab/c1icDji/4fun_funny_video_app_download.pdf
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/bajet-tibimuremidosax-xiwejafumesuno.pdf
    • http://fuwefepor.iblogger.org/beatstep_pro_manuale_italiano.pdf
    • https://gefifilasi.weebly.com/uploads/1/3/0/8/130814980/pawaxulexixuzetatew.pdf
    • https://cdn.sqhk.co/vakamuzawa/bihiejf/21502669265.pdf
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/tuvubepujedomekaber.pdf
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/890399.pdf
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/6832520.pdf
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/795263.pdf
    • http://betabudon.iblogger.org/cromwellian_plantation_worksheet.pdf
    • https://cdn.sqhk.co/somujatiza/jehaQgg/dodefapufu.pdf
    • https://cdn.sqhk.co/vuluzazogur/eghf0Iv/tiki_taka_world_soccer_apk_download.pdf
    • https://degetopej.weebly.com/uploads/1/3/4/7/134727915/9046066.pdf
    • https://pegujugadul.weebly.com/uploads/1/3/1/6/131637136/5357440ba9e971f.pdf
    • https://cdn.sqhk.co/nekuripafi/fuhhD9g/zodejopejawen.pdf
    • https://dawitomow.weebly.com/uploads/1/3/4/4/134439013/1366602.pdf
    • http://walokarora.iblogger.org/beginner_english_worksheets.pdf
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/wetesar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aa4e3c5c-45af-4b68-94fc-79f4a9340cfa/lirafugez.pdf
    • http://xakosafejel.epizy.com/dawapepefonazijure.pdf
    • https://uploads.strikinglycdn.com/files/6f1b47ad-09fb-4b7c-9146-ab05ec13f264/how_to_scan_from_epson_printer_to_mac_computer.pdf
    • https://uploads.strikinglycdn.com/files/a1506218-98ed-4a2d-b8b9-ee19a303749c/le_petit_prince_french.pdf
    • https://uploads.strikinglycdn.com/files/ceb7ead6-99d6-465c-beaa-00a42f08e665/what_percentage_of_hospitals_use_ehr.pdf
    • https://uploads.strikinglycdn.com/files/66e3159c-015d-4223-a3d8-f981fbcd43b4/doziduvilomofi.pdf
    • http://gofosuxubajo.epizy.com/bombsquad_ultra_mega_mod.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_off0000f43a.bin
c409222c2069387b6c51377dd2546363c94bb8ba1cfb02970a69e9d3f427e38a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 5452 bytes
font_01_sfnt_off000106e8.bin
1b2d0376fabd420906ebb7faebf9706d896a443224d3ebfb72e021e222a0c0c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10684 bytes