Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde4f959a5e995d2…

MALICIOUS

PDF

69.0 KB Created: 2021-03-15 23:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d71596874f357b927edf57b26d348fc0 SHA-1: ea5a4c76284fcbdfa15a00f8bd18ea47d6a0023c SHA-256: dde4f959a5e995d2fccaad9e65fcf72b0fd18f0becd33a331bcf6b42b9853419
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=latin+answer+key PDF link annotation
    • https://cdn.sqhk.co/xupodafib/jggjSha/beganol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_601ae0b2c0242.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/jfnidnL/minecraft_earth_mobs.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jelheR2/numuvabanisaxela.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/ejhEvGp/23550118061.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hhjghiq/harry_potter_hogwarts_mystery_unlimited_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/jhdibls/us_national_parks_passport.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fe11c00bb6a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_edd69b5048e7445e9151a23ada11f2f9.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_410fd6ee5d384cd7907dcc9e7983025e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/zizemoretu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/95096053575.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/6631443032.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_7b8560c50c5e4bc1a80afb8fe7b1335a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagokiko/systematic_integrative_literature_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/dosusesigazodotuwojugaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/uel_moodle_absence_form.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_b4dbf601a708416d8b2229a50d016568.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/tobafetojifuzibaxa.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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 4848 bytes
SHA-256: 73224fc3bf979af96ddc7890495b74642210667df3b0c2124aac6647d8828800
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 10560 bytes
SHA-256: 9df695fdc41b448810af19879e5a77709677f25aff2df1567f383eaad3d63628

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