Malicious PDF — malware analysis report

Static analysis result for SHA-256 9131de82cc6d4184…

MALICIOUS

PDF

86.7 KB Created: 2021-02-05 16:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a8d1b8efd771ddac5f2fef86dabe0f2e SHA-1: 9d48a56c1eb87a473a6a1b426e33f42ada9f46ef SHA-256: 9131de82cc6d4184e7f42875834aeefc2882b873bacf2215ca5a9c9b363a48e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content.

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://bologen.ru/123?utm_term=madden+19+coins+hack PDF link annotation
    • http://belplitka.ru/essential_hematology_book_free_download6en7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5fd823d661c79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fe3223f2d31c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376852/normal_5ff4266482a60.pdfIn PDF document text
    • http://espaceabonnes.com/lozufifopituqw3xo.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/fuxotozajojufejibuvi.pdfIn PDF document text
    • http://lifegirls.site/49164313232xtmwn.pdfIn PDF document text
    • http://sbrf.link/383687292993fqh1.pdfIn PDF document text
    • http://segwaywheelchair.ru/sufemomojujiramycns.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/14011767955tko8z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fdee85e1b636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/answer_key_neet_2019_official.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/ximanal.pdfIn PDF document text
    • http://wuduzukatej.epizy.com/14574211948.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/xesesuxe.pdfIn PDF document text
    • http://tafikepuvanotu.epizy.com/java_string_format_array_values.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/milestones_presentation_template.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/belly_pork_cooking_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5600 bytes
SHA-256: f13a928bd80d342035c9663b71a388381109142df95b0890fdf21c0262bb8a9f
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 5176 bytes
SHA-256: 14a3ad74158e805609b2a2e2e381f32cd3aac31452e9de3af881f64cd95b42f6
font_02_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 12912 bytes
SHA-256: d4e69491848ee4735b378161b0d5abdfbc51236337a1390424d3290514223751
font_03_sfnt_off00013807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 16208 bytes
SHA-256: 3d7659f6ad424396c8dcf660cd560065b0a726982e29a57e3bab81e00a6b50b5

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