Malicious PDF — malware analysis report

Static analysis result for SHA-256 75016f4bfb41dd88…

MALICIOUS

PDF

77.0 KB Created: 2021-02-18 14:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 732d76d759476780e3b082ab33f4afe9 SHA-1: 9a6a8f93564d60e76e47770249b8fba60461f6f0 SHA-256: 75016f4bfb41dd88b22d0729c8ef8890623800f91954fa3a2b5b601b8bd146a7
184 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 URLs, many pointing to disposable domains and flagged as malicious or unknown. This strongly suggests a phishing or scam campaign aiming to redirect users to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://yafferge.ru/aws?utm_term=short+story+prompts+for+kids In PDF document text
    • https://cdn.sqhk.co/xikokopek/50gc9yp/xamawod.pdfIn PDF document text
    • http://fsbsiod.com/69166153612kgwd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6011726316bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6022f53af3b74.pdfIn PDF document text
    • http://glossywp.online/instructional_planning_and_teaching_strategies_mcqsi11t6.pdfIn PDF document text
    • http://vehicleinsusa.com/fowujo07vv1.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/ROLopwI/tropico_6_nintendo_switch_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_602e396d9774f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_5fe809956f16e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff442624dca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5fda17892fa32.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/chfihhf/joboxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_602c0eecdb062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jagesaba.epizy.com/what_hurts_quotes.pdfIn PDF document text
    • http://tejovixija.rf.gd/uroboro_sql_formatter_sublime.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/76727513235.pdfIn PDF document text
    • http://besogigususatu.epizy.com/reverse_austenite_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/lajafaxaxulup.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/jizalipuretapom.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/gofilemuxime.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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 5308 bytes
SHA-256: 618f7b1d603ff40c8c2cc7416ff083579d6d4055b1c61ee7c7e6749252cb6b46
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 10432 bytes
SHA-256: 519c0ccf3ab9a430c9f6d8406af454832b26841500c7041ee598f9b9c7de5564

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