Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be1e80acfaa82e7…

MALICIOUS

PDF

101.8 KB Created: 2021-02-15 06:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 302f05dade7179d7161d7c2692c305f6 SHA-1: a7be50a5fbf82a8845f7c48ee65c77e686e3dcff SHA-256: 7be1e80acfaa82e7e1c6a2a7f2523578db661cfd8c77cd01d4e343e1b813cfff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, identified as a link farm, with a high concentration of links pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The embedded URL and the nature of the link farm suggest an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=xbox+360+roms+pack PDF link annotation
    • https://lasezafokovopar.weebly.com/uploads/1/3/5/2/135294620/7720907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_602473c47faf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ff13efa9714b.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/pujiziketa.pdfIn PDF document text
    • https://xidozuju.weebly.com/uploads/1/3/4/5/134597445/pimamotis.pdfIn PDF document text
    • http://cashfree.store/autonics_temperature_controller_tzn4l_manual2zma3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6011b029b1997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465704/normal_5fe00f891c91e.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/1a333c.pdfIn PDF document text
    • http://zakazuvanadoze.66ghz.com/electrostatics_worksheet_grade_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_601e1dfba3163.pdfIn PDF document text
    • https://wojizenufojanog.weebly.com/uploads/1/3/4/7/134724603/fc5d6b654b0f117.pdfIn PDF document text
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/1182ed513a36b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boxokur.epizy.com/adanga_maru_movie_songs_free.pdfIn PDF document text
    • http://nafebuxu.epizy.com/baahubali_movie_tamil_hd_free.pdfIn PDF document text
    • http://padunogesabe.rf.gd/2019_beers_criteria_pocket_guide.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_off000143aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 5756 bytes
SHA-256: bb49a893cd523addcfe01e196bced9e5d4855d6a3b2deb1af99c62f2e40a2bc3
font_01_sfnt_off0001572c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572C 15936 bytes
SHA-256: 9a823d3b272f0a313e368a4db3e4b70fadad0b8ea5c85e8754b9deefc5fbcacd

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