Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5dd9cd043c33d6…

MALICIOUS

PDF

73.5 KB Created: 2021-03-03 21:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90f8183549b5fed6a3bafb90be07507f SHA-1: 692eb874a4f29fc3d3e4937f3d248d38f8844bff SHA-256: 5b5dd9cd043c33d6531db300d33ce845c2215d0c71ca6e034266d3872f31dab0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though partially corrupted, includes a title that appears to be a lure for users to click on these links.

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://fokemale.ru/123?utm_term=what+to+bring+to+your+permit+test+pa PDF link annotation
    • http://summerita.fun/624157426611kf8b.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/8aWhcgc/60108923098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_603a238a7380f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5ff493837aa36.pdfIn PDF document text
    • http://beremoter.online/kinobody_superhero_downloadt6i58.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/o9idBvi/63717864074.pdfIn PDF document text
    • http://shopwithsale.website/bently_nevada_3300_xl_wiring_diagram5yyj2.pdfIn PDF document text
    • http://nefritthebestthing.site/past_perfect_continuous_tense_worksheets_for_grade_86b54i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_602f18b97a7a4.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/giChcgf/whatsapp_images_free_download_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/jeEgjjg/tazubulogeforaguvigaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_601624ba5bdc9.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/TMQihhb/how_to_make_mini_basketball_game_from_cardboard.pdfIn PDF document text
    • http://ketotreno.buzz/27315232369apo9s.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/tidigudetefumof/fleischner_society_guidelines_2017_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/xivogofixipidalatonefumo.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/91140566254.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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5456 bytes
SHA-256: e4414cfc0483c814b61816aaa0e92be14d96ca197f06e0fef081ed6ee98c9357
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10364 bytes
SHA-256: 62eac87e4c06e23547bf62a94db5ceabfa3034bd7b77a9a30670ded890d73812

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