Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d475dc1d1e0f415…

MALICIOUS

PDF

70.5 KB Created: 2021-06-14 09:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b1dc47f5d656bd15617bdabe8b6bd7b6 SHA-1: ca75be14befaf980b1a90b3b85496eacb5ef735a SHA-256: 9d475dc1d1e0f415d74b1db9fac669558a57f5bee15c817a7a8c98db8c8e4da1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'allytemp.ru', suggests it is part of a link farm designed to distribute malware or facilitate phishing. The document body, though heavily obfuscated, contains metadata related to PDF creation, reinforcing its nature as a document-based attack vector.

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://allytemp.ru/pbw?utm_term=payphone+piano+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369305/normal_60532d20c3fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd2fa604de72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_604d9d6f45597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600db9e39aab6.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/1088641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_6064c2d335376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5fdf0d013911d.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/80157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5ff78369e8303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456663/normal_605db5e73815c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxafivimit.pbworks.com/f/how_to_get_fortnite_on_school_chromebook.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/30533282131.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144411810/astrologa_y_numerologia.pdfIn PDF document text
    • http://pikalunik.pbworks.com/f/mortal_kombat_apk_unlimited_souls.pdfIn PDF document text
    • http://xupatamim.pbworks.com/f/945190597.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144663699/43361176979.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144583377/ads_sensitivity_rainbow_six_siege_console.pdfIn PDF document text
    • http://jisopubo.pbworks.com/w/file/fetch/145066527/instagram_verified_symbol_emoji_copy_and_paste.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144536898/scotts_turf_builder_edgeguard_mini_broadcast_spreader_settings.pdfIn PDF document text
    • http://bizogug.pbworks.com/w/file/fetch/144760428/annual_leave_calculator_for_part_time_staff_uk.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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 5368 bytes
SHA-256: ad3eee744bd38cdabf847112bf246c1bee88fd5e8634a549dc834e93fa7fd276
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 10084 bytes
SHA-256: 99cb64f224dc2d286a710456cc1cef4bdde73eb05a75d0dabd9756ce42c70c52

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