Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8fc7323294b3f2…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 23:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99b02db2d65f3496e57c2b863a102f92 SHA-1: 174b351fc4dca536f3f1ba2d62058ba934f9a529 SHA-256: 7c8fc7323294b3f27ce7434b9958002b0c5bb4c2f4458e1ecac042932ed962a1
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=hodinky+casio+g-shock+rangeman+gw-9400-1er PDF link annotation
    • https://cdn.sqhk.co/kinibemazoz/cifNx6F/world_warships_combat_download.pdfIn PDF document text
    • http://barberking.best/waralulipogiga5pho3.pdfIn PDF document text
    • http://techanomic.com/bekixigokolitidudopovfjb8w.pdfIn PDF document text
    • http://shoppingyxplus.xyz/xetixpwlox.pdfIn PDF document text
    • http://fionainthefield.org/rite_aid_blood_pressure_monitor_bp3aq1_manuali6e91.pdfIn PDF document text
    • http://plsale.pro/hernia_inguinalis_medialisqzn49.pdfIn PDF document text
    • http://teaitalis.space/betoboxojusab2kuop.pdfIn PDF document text
    • http://procripton.com/timestamp_format_in_oracle_dbmq8j3.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/Chfjjgi/53407127823.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/gjGq0ib/yeezy_hyperspace_release_date_uk.pdfIn PDF document text
    • http://madamzero.com/45159869801ar0mq.pdfIn PDF document text
    • http://trysalon.xyz/why_geography_is_important_for_the_study_of_history3sisu.pdfIn PDF document text
    • http://bigwin-1xbet.fun/niwubipinut1n84u.pdfIn PDF document text
    • http://atelier-spb.com/vonetanukomumukumatu3v39g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb76311-c5b0-4d41-827a-6d9b0aa9beec/is_maze_runner_death_cure_the_last_movie.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_04473bb6f59e44b5a0a7638a2ede7a3c.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_7739a610bfe54e29bb91e48f9368fb21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3caaefd0-9e2f-4ccc-a54b-864d4e8fa896/guxure.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 6012 bytes
SHA-256: c149c1d94427c17db1b6bf19650c7c51555bdc00da450cf77d700b164763b8e1
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 10784 bytes
SHA-256: b86f01ca61a680c5077238261bb20188bf6d66e33570753481c3f904055dd17d

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