Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4702ea5b2a6854b…

MALICIOUS

PDF

78.9 KB Created: 2021-06-01 08:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bad19318f29c267fccbd9961220d84b3 SHA-1: dda0a017035b7d025ced20f484572ff5a95c8e41 SHA-256: d4702ea5b2a6854b0feae75f1103268a6be221f35dfbff8e963aa288a3c25a79
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/123?utm_term=sample+us+passport+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5fdc09b165282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fe63a404011f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5fddb1de68076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6019a01950b82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144424710/75349260745.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144435297/how_many_chapters_are_in_diary_of_a_wimpy_kid_wrecking_ball.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144437043/42828650781.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144413754/simple_explanation_of_delegatus_non_potest_delegare.pdfIn PDF document text
    • http://botinuba.pbworks.com/w/file/fetch/144414594/tijenadekufekijiv.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144447930/afterglow_app_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a02c00-1439-4354-9a09-1afd2c6f503b/75246790696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c8ff5f-065d-4889-8f82-0691e376bf87/nemereb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0284ffdf-878c-4f5c-9dbf-bce442568a0d/dividing_fractions_worksheets_common_core.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2506b490-c776-4f10-8c7d-98bec7d4f1f0/manewinomirijaronuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ef11a6-991f-4459-a7c4-7dabedd703f0/twilight_movies_hindi_dubbed_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff12aef-1146-453b-b1b1-f5e182807d1a/is_there_school_on_thursday_and_friday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb9e0b0-235d-4634-9997-c9bce45d67b6/suduxeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 4880 bytes
SHA-256: efb79cac7eeac557da6d6a322f3a3374a15074b10e04866d189d35882a49a50f
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10320 bytes
SHA-256: e4828d29572ee47d4a20eff52e28ca3796310cf3177957df255395bfb1f47921
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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