Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9013fe35883c88a…

MALICIOUS

PDF

71.2 KB Created: 2021-05-22 21:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d94b62c9d2f219226edf94930d0ebee5 SHA-1: 255e36ad61e3db2f395eb4e93ea1b7a74e456abc SHA-256: e9013fe35883c88a03710077fd5c3a3e89caf6674f6d16e590cd1e9337c5a0aa
164 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a mass external link farm, with one prominent URL pointing to 'jacksth.ru'. The document body, though heavily obfuscated, contains text related to resetting an iHome clock, likely a pretext to encourage clicks. The presence of external links and the ML classifier flagging it as malicious strongly suggest a phishing or malware distribution attempt.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=how+to+reset+ihome+clock PDF link annotation
    • https://danonifakusore.weebly.com/uploads/1/3/1/4/131483465/4396031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fe744b04583f.pdfIn PDF document text
    • https://pakitaxe.weebly.com/uploads/1/3/4/3/134318313/gijupovi_kidevagi_gamirobutupejeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_60082f4a2f0f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601a66c28be20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_60520d439262e.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/823141529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_6012085662d39.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/edea6e2.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/redegelesibif/what_are_the_enlisted_ranks_in_the_marine_corps.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/piwaduxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a50c60c-051b-43c0-9572-e63241157063/47970313551.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/aaa_travel_guides_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a16354-f7ec-4b81-87f8-f6cff3d914a6/44316049565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8297ec-7c7d-4dd1-89b5-18866b230f3d/pretty_little_liars_free_season_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080ef811-68c5-43dc-8eda-7e8fc5ef4246/59782368979.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/a_cuanto_equivalen_10_centmetros_en_pulgadas.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/51020617698.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 4948 bytes
SHA-256: 3f1ae47c2da855e0eb7bc72c37cd454da602f1b01704259965d8405a2ee974df
font_01_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 11456 bytes
SHA-256: 8a7972bf6e3206828667bc4d181ad406a62abc6127691d41aac627b61f418d1a

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