Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49c7373998a9d1f…

MALICIOUS

PDF

79.0 KB Created: 2021-04-16 05:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fac1a18b32ecaee61c44eaac5835b5ec SHA-1: 2587b2ddb043e3c591a2f91073dd6b4589ef37e6 SHA-256: f49c7373998a9d1fbea09f94aa9766260f9d28724cbafc606a47f701677d019a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading to a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=what+temperature+is+a+self+cleaning+oven PDF link annotation
    • https://cdn.sqhk.co/zowolanazew/ZhdTXNR/soparewizuzowefox.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/hxDVExx/46115268504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_60487063c2612.pdfIn PDF document text
    • http://twoup-viktoria.online/vert_shock_program_freey4bup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_6037f3bf641f3.pdfIn PDF document text
    • http://pushbiz.fun/683548573418k4mo.pdfIn PDF document text
    • http://apkweb.net/ryobi_40v_chainsaw26v26.pdfIn PDF document text
    • http://opros.xyz/ez_prompter_software_free8giir.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/vLkzibH/baxipopusor.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunivugame/Qhbg0gc/weekly_calendar_2019_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/nujoxodove/hgfhhM6/rupozeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutisigila/what_is_a_social_contract_in_government.pdfIn PDF document text
    • http://xixitokap.rf.gd/2141430645.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/brewster_ma_weather_report.pdfIn PDF document text
    • http://fakonin.rf.gd/dieta_doktor_budwig.pdfIn PDF document text
    • http://zijurape.atwebpages.com/12066721810.pdfIn PDF document text
    • http://lapamapifutul.epizy.com/lopemuzakeduf.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/causes_of_greenhouse_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/song_betrayed_lil_xan.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/definition_of_business_research.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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5500 bytes
SHA-256: 32ddfa99707f5f7616e7ac47ceea9fe3a85173e36d4a4a0f51b7f11a947d9339
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 11256 bytes
SHA-256: 8986746f7ec936f6e5ab71f52b6b535d2ed9818c12f9c0e752ae861faf504e3d

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