Malicious PDF — malware analysis report

Static analysis result for SHA-256 16256f4051add5c8…

MALICIOUS

PDF

70.0 KB Created: 2021-03-06 01:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3ab13564f591db38adca2e2eab039dd6 SHA-1: ffda646f5e47863668b71e44652f2c636b8779b0 SHA-256: 16256f4051add5c89dd6a5ca8993e448057f442ce80e3774a4a41ef1e618c303
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://dugedepap.ru/strik?utm_term=el+hobbit+libro+precio', is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=el+hobbit+libro+precio PDF link annotation
    • https://cdn.sqhk.co/ranemagesoga/Ftjqegf/kamixebigezuwiwexameb.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/togodowib-vumuzekazatizow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_6023c8d6939d3.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/tifumamofepet-xagutusora-tuzato.pdfIn PDF document text
    • https://sudovirikil.weebly.com/uploads/1/3/0/7/130739802/nodajawifokofu-nexasiwojixet-jejowunutubure.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/nobulaxe.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/xuzawimixiramik-gifewekinadedum.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/nogemevoj.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/bokeg_botawotulinaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/hZibhaZ/food_business_name_ideas_generator.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/bomefapulotuf-wiwipopenuva-kitovemutubizo.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/cLEDhhH/peridot_pictures_steven_universe.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/Ciiehhf/powerline._io_unblocked_cool_math_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fe0a7ee72d6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vabedafozo/1987_omc_cobra_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f04f3c-c895-4d3a-9cab-76e60197d175/44065858108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1bce1a-02e8-4c4b-897e-c2fb7415ad2d/evaporation_line_vs_positive_blue_dye.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/havoc_demon_hunter_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264356d0-2e41-409e-8201-7ff582d355b6/soccer_classes_for_10_year_olds_near_me.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 4412 bytes
SHA-256: a36d4487193ba5010aef096dbae0882c93f5c179a0d3aee3fd3da54239338c1c
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 11244 bytes
SHA-256: 845db6ab551a55df22b2798fd67d7d2de5e5d6de65edf82f8fb05d4d1c0eed48
font_02_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361