Malicious PDF — malware analysis report

Static analysis result for SHA-256 d751bf58634fe61a…

MALICIOUS

PDF

71.3 KB Created: 2021-03-13 13:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d647f253edceb55fca4006fb8f996af SHA-1: 91051ca6978c0b18ccd3670b0380abbcdbf02548 SHA-256: d751bf58634fe61aa91357b749e50728f02f62d89e118883e1511e86315f4214
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/123?utm_term=apptrailers+apk+latest PDF link annotation
    • https://cdn.sqhk.co/sozivowemin/fkgd2he/car_speedometer_application_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_603b6209bbb89.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/hghfxLh/expanse_as_a_verb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_60313456d9c8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_602776be9116e.pdfIn PDF document text
    • http://suzolovopu.iblogger.org/workforce_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/BdjgjjS/download_game_cartoon_war_gunner_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_603ac911bd6ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600e4889be973.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/8ghyHhi/sonebimobavopurekaxalav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_5fdbdf47e2cda.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://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_290e00928cc940f59aea9d7abfaf415e.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_e68fc656e1054999b842825e10205bef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawuvud/17400535345.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/55310209475.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_ca23312048514c92ae623c19b65b5b0c.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b462262442264d179de1d21dc11654d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/sat_math_2_score_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/bengali_tv_serial_video.pdfIn PDF document text
    • http://kanalase.epizy.com/zf_transmission_fluid_alternative.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_fcc1eb3522e94ee2980bbeb89feb7f9c.pdf?index=trueIn PDF document text
    • http://josuremase.rf.gd/format_json_string_c_newtonsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/13774428231.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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 4440 bytes
SHA-256: 056b2a63c4120e99f820e30c4c9886e6569b259a019558dbc98de2c8521d4c9a
font_01_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 10196 bytes
SHA-256: 812747e749f0d267442b52effbd11f0488b5296b13068aaf268a1aad61102754
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333