Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11fbe1f5554b96a…

MALICIOUS

PDF

70.4 KB Created: 2021-02-26 09:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55ea205f541f39fdf1937a0739360026 SHA-1: c9784d72aea2fe7065dd1609e45d80a3b292e55d SHA-256: a11fbe1f5554b96a64825bb615d7ffecc6d414d756bc7feb0ef402b012402708
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to lead users to potentially malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external sites for phishing or malware delivery.

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
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=panasonic+toughbook+cf+53+cmos+battery+location In PDF document text
    • https://cdn.sqhk.co/lojibuwe/3uxHCig/picoseconds_to_nanoseconds_converter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5fd8f5b73b77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_60078ccb97c04.pdfIn PDF document text
    • https://banabujoro.weebly.com/uploads/1/3/0/7/130776007/7460800.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/6b4b3aa715b34e.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/igiaFNy/xanodisalagoridip.pdfIn PDF document text
    • https://pojamemurix.weebly.com/uploads/1/3/1/4/131408024/jarotidex.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/Siijdgg/idle_heroes_private_server.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_60062af93b22b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5ff35064e599a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496013/normal_600c061c2900b.pdfIn PDF document text
    • http://noksipals.online/resoda14sq0.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/ihgdifF/cube_rush_adventure_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/buponuwebi/complete_america_s_test_kitchen_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/vatesatiwusoloxitobakafuj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 5772 bytes
SHA-256: 1da9a7f596d0fa2358d88c0995b16c5c5e70bba569962f639f4064790240df31
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 9920 bytes
SHA-256: 0450314c5f794c830d6ea330baf7b88fbc4d7a692747e30b42d8f53f30281fb3
font_02_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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