Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffe74ba03303018…

MALICIOUS

PDF

76.2 KB Created: 2021-02-01 18:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab7ba98970153723fa39e6b05481aca7 SHA-1: f5db19790d00cf3f5f9068cd4713189bbd1e6ff0 SHA-256: 8ffe74ba0330301879aa08b0ec8b05a4b8ba3a1ea9d216bfa341d94d46af2e73
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a lure related to 'free printable phonics worksheets'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially malicious content.

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://jacksth.ru/aws?utm_term=free+printable+phonics+worksheets+phase+5 PDF link annotation
    • https://cdn.sqhk.co/feguzuvubut/iieZkKa/stranded_without_a_phone_game_walkthrough.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/dalokove.pdfIn PDF document text
    • http://2gusevshop.space/blender_2.8_the_beginners_guide_downloadkg8kh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419194/normal_5ffeb0ed19c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/jiayTib/1157461764.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/63812417850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_60163e96bc36e.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/gym_program_for_beginners_maleixtqx.pdfIn PDF document text
    • http://digitalmicroteter.xyz/amazon_prime_now_gutschein_erstbestellung1hadh.pdfIn PDF document text
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/rejiwixebojeroz-tuzorujozuzabad-pawizoxonemejut.pdfIn PDF document text
    • http://sungo1.space/76411570275ho5qi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_6005171481f29.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/aggrUje/gubifolorew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/password_file_for_brute_force_attack.pdfIn PDF document text
    • http://mirepili.epizy.com/88900894502.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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 5396 bytes
SHA-256: af4d240b8405cc3643e631905e3fdb785e9b5695e64572a1ff07e3c2b35187d4
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10700 bytes
SHA-256: 63de5bba2eb1389d8190d8b759c83d299d407844015ce691f399ee5e33cbb5f1

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