Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4643d0b609bd1c…

MALICIOUS

PDF

78.9 KB Created: 2021-04-06 16:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 643b72e987348e6991a08354419b4748 SHA-1: 222b198d78a3198487e82b58a324abb432964203 SHA-256: 8b4643d0b609bd1cbc051849b993deb25e7e0ecc9cbe439d83de0962065c9a47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to appliance manuals, likely to trick users into clicking malicious 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://jumiwimov.ru/wix?keyword=whirlpool+refrigerator+model+wrs325sdhz+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413735/normal_600e21e7efb37.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/gixRib2/custom_cake_makers_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/dxXhatA/bluetooth_software_free_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kidobogi/6jh7EvW/israeli_national_anthem_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/UqihVha/12934312631.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/eky8Xta/8472144625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_6002e5958dba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_6022c2e06baed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_6009d55cec004.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/chg0hic/my_movies_pro_3_pc.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/liwara/zarchiver_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/71347523119.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_500ae94d99094b56a693ca58f11928ff.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_a3b24c7dd024454ba2d7a48b19f34142.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_b4ef83d0cde544a6a18227fcc85eeddb.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_78c931ee6cf246d3beba4462661d64ad.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_6c9b0e6bd7a84c568874f68984f12948.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/bling_ring_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/why_wont_my_samsung_oven_heat_up.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_05c7f82d4cba47709ccbfd66d3c0671a.pdf?index=trueIn 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_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 6028 bytes
SHA-256: 900b6abf412cdac9a35042306eb2866b80bad574b55d698380aaeaba91aec53d
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 10968 bytes
SHA-256: 0dda2bbab5db6a5bde0d974c8c5b987fdd814f55bb959575d65bc64309789dd8

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