Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3339c8f4795d62…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 10:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d6d3a35f0f2ea4c7a2b07e256f972255 SHA-1: bb3b6383eb4002d7c0fda7cd9c80b5a4905e4b90 SHA-256: 3e3339c8f4795d629185962f161a87dbe68cb0561354d2e5be818b78a0e33781
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 a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as legitimate downloads or resources, indicating a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to use link farms for SEO manipulation or traffic redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=bookmark+pdf+free+online PDF link annotation
    • http://korsabarca.com/national_song_of_pakistan_videozboqp.pdfIn PDF document text
    • http://netewe8.xyz/85117731027sdt1d.pdfIn PDF document text
    • http://instapriz365.site/johnny_b_goode_tab_songsterr04i33.pdfIn PDF document text
    • http://liketime.online/liebestraum_piano_sheet_music877iv.pdfIn PDF document text
    • http://euromarket.pro/7157013360994zy0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_601d224382566.pdfIn PDF document text
    • http://bluhgang.best/lukebt98ho.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5ffeb1c47cc1d.pdfIn PDF document text
    • https://wifovusu.weebly.com/uploads/1/3/4/3/134312249/6827635.pdfIn PDF document text
    • http://yoptan.space/51434304724f7tgw.pdfIn PDF document text
    • http://mini-cam-v2.club/bodmas_questions_worksheetkg26t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_602ce24c38d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5ff98a0806e7b.pdfIn PDF document text
    • http://marketes.pro/marvel_comics_characters7gm78.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/ridedetusavokidagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_602d27d30ee6c.pdfIn PDF document text
    • https://nukogakulezov.weebly.com/uploads/1/3/1/3/131378840/liludavejegig-viwamanevobiwig.pdfIn PDF document text
    • http://anarchymedya.com/singleton_straits_approaches_to_social_researchhehwg.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/dudujopixejikug/wewewuzerir.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/nikolewozip.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/80250525224.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/wordscapes_answers_tide_ripple_10.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 5124 bytes
SHA-256: 084d2c1228b6cc3cb3f5eaae60bdc6a0af449a6705e7e5cb026f386da89e1d58
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10580 bytes
SHA-256: 0f8bbd5e39e90e76cf503030a028b2e43f4b1fb2fe022d487ad7a5ae5bace3b2

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