Malicious PDF — malware analysis report

Static analysis result for SHA-256 21546e45bfdc8436…

MALICIOUS

PDF

74.4 KB Created: 2021-01-12 15:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5c024f7d9d2dad58a465165406def77f SHA-1: 2c939bdd8c64f60d1b22ebc6582b3740bf0e10d5 SHA-256: 21546e45bfdc843629f531acfaebbc1f68d400ce8c3c35f5f6d75628907838de
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at `https://traffine.ru/aws?utm_term=arial+black+normal+italic+font+free`. The document also functions as a link farm, hosting many other PDFs on disposable domains, indicating a likely phishing or SEO manipulation scheme. No scripts were extracted, but the presence of malicious links and the overall structure strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=arial+black+normal+italic+font+free In PDF document text
    • https://cdn.sqhk.co/xezexasag/YRNWG2C/fazotiwu.pdfIn PDF document text
    • https://site-1177285.mozfiles.com/files/1177285/retro_wallpapers_for_laptop.pdfIn PDF document text
    • https://site-1166703.mozfiles.com/files/1166703/husqvarna_chainsaw_manual_240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fde7f96dd60f.pdfIn PDF document text
    • https://site-1247186.mozfiles.com/files/1247186/37119245192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5fba7e818ade1.pdfIn PDF document text
    • https://site-1176319.mozfiles.com/files/1176319/rawopubaxebopefiwal.pdfIn PDF document text
    • https://site-1247964.mozfiles.com/files/1247964/zanadogamo.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/hjajjgd/gogunizadupogugelax.pdfIn PDF document text
    • https://site-1228102.mozfiles.com/files/1228102/funny_pics_of_animals_with_words.pdfIn PDF document text
    • https://site-1173941.mozfiles.com/files/1173941/15702142083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_5fa0c329262bc.pdfIn PDF document text
    • https://site-1171608.mozfiles.com/files/1171608/download_pes_club_manager_apk_data_offline.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/jezobasit/27659341219.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 5044 bytes
SHA-256: ccad99992eeec985da28fe5b79084cae4b52f3f3ce412fe47db4d2f14a50c19c
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 10920 bytes
SHA-256: 5ee91d33efe1d28fa904873860c72f12e636d5b9f639db07da053dfb4db7faf0
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16084 bytes
SHA-256: e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee

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