Malicious PDF — malware analysis report

Static analysis result for SHA-256 4236d92e63c9c0cc…

MALICIOUS

PDF

78.1 KB Created: 2021-04-15 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d54b51b6833d4163c2b7277d9c7e233c SHA-1: 3db73e3d781277eb6a7f40bbac5214d381814bc1 SHA-256: 4236d92e63c9c0cca7597e9b9b98fe1b462acbfd9f5dfad03213ac7e84d4cdcd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, with a primary suspicious URL being https://maypoin.ru/strik. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to disguise malicious links. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://maypoin.ru/strik?utm_term=last+wish+raid+guide+2020 PDF link annotation
    • http://luminar3-download.xyz/71986947073zqqno.pdfIn PDF document text
    • http://naturwows.space/771767237064etxs.pdfIn PDF document text
    • http://vashastrahovka24.ru/gameshark_tm_codes_emeraldqw7fe.pdfIn PDF document text
    • http://mkuu.club/planeacion_estrategica_definicion_e_importancia5lcj5.pdfIn PDF document text
    • http://itabody.space/lulesezopulimur298u.pdfIn PDF document text
    • http://fbcopyright-center.com/46826668253cx42i.pdfIn PDF document text
    • http://probmake12.xyz/sobavodekimuxatagn69px.pdfIn PDF document text
    • http://serusidam.iblogger.org/9180359573.pdfIn PDF document text
    • http://richteam.site/3836984610425cmh.pdfIn PDF document text
    • http://zzzmmmmejjj.space/66879896833tzlci.pdfIn PDF document text
    • http://zumodaronomana.iblogger.org/search_engine_marketing_basics.pdfIn PDF document text
    • http://donuzas.22web.org/aviva_travel_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puxejinasor.epizy.com/brandon_bernard_1999_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/kadatigurigogate.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/3403110653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede3b348-6b40-49d1-a13d-18aa7408a94d/nudevenomodesitot.pdfIn PDF document text
    • http://mujevevurisul.epizy.com/fifevogonuxamakifipaxewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331df085-83c9-43aa-b25d-45ee9e41d376/how_to_connect_ipega_9076_to_android.pdfIn PDF document text
    • http://xinozotaga.rf.gd/87157570869.pdfIn PDF document text
    • http://patabajisof.epizy.com/adobe_lightroom_free_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7557ca-730a-49b1-823f-8a3637116482/cuadernillo_de_actividades_matematicas_primer_grado_secundaria.pdfIn PDF document text
    • http://mepigijevu.rf.gd/lenovo_t420s_i5_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b880e2-caed-44b5-ab44-d2b9d4d4ca46/33190982025.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 5360 bytes
SHA-256: 123b3c0303ccc8d40799a612fd710a97379e66ab2ef0a4bd3936834c866651a7
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 11060 bytes
SHA-256: 835cf010fcb5702d9e67affa24a4ee832b46a3e73233ea23df2b6f551dd2bb8f

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