Malicious PDF — malware analysis report

Static analysis result for SHA-256 34668c5f48f35c78…

MALICIOUS

PDF

75.5 KB Created: 2021-03-16 19:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc6cd66a83806a9ced92ab09412d1a3c SHA-1: 9f99c1f547f06c204d0516bd086b5816ed5b56ae SHA-256: 34668c5f48f35c7868a5ffbe647bec61d53920c76d9e330fd08fe5c5a2fea8e7
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 0.9999

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://jottigo.ru/123?utm_term=embedded+systems+important+questions+with+answers+pdf PDF link annotation
    • http://japarof.mywebcommunity.org/45539639563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5fd92a1bf0ea9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455390/normal_600932a40b236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c1028a87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_60279a8d55491.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/ieMifaa/fishing_paradiso_mod_apk_2._3._7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5fdf5821e0bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_6047b9295ece7.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/hdJfmGH/equalizer_pro_apk_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5ff59b57db00c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fc7c9c79c977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikijanux.atwebpages.com/how_do_i_connect_my_samsung_wireless_printer_to_my_mac.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_5f608a1bc6884f2ab9db0f72c0cf7369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/14866087729.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/demefiruvemef.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_ce255ca3e7054fca9c0bc10ba1f8ea48.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_1bf654316bee4babb056ade8d0f5efb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/62583505561.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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 5668 bytes
SHA-256: 30a6876f780d61eff7961a3b1d4d0da152f14e4d5307182b955c79bfe3a8a594
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 11228 bytes
SHA-256: 2dbb994c16d5cafefda4314a6593d5b8ec92c14f9b8f10c97f6cf9cf7d09e87f

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