Malicious PDF — malware analysis report

Static analysis result for SHA-256 3491a35c4508cdd4…

MALICIOUS

PDF

78.4 KB Created: 2021-02-19 13:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 20cba9d69859cbd42794ee3b975e36b4 SHA-1: 4f173df076a18ef7cdedbe7977d239bbc49a67a0 SHA-256: 3491a35c4508cdd44e6fb60b4b893153d3ba1a2b7fde80276e06f13b2a141b85
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attempt, likely leveraging a PDF exploit or social engineering to lead the user to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=acorn+superglide+130+error+codes In PDF document text
    • https://cdn.sqhk.co/mutexeze/dyieaja/notes_online_free_no_download.pdfIn PDF document text
    • http://fartook.online/adolescent_reproductive_health_services9adkn.pdfIn PDF document text
    • http://thefortykuti.com/66568737658ljn5v.pdfIn PDF document text
    • http://alifan.store/788802517972z8va.pdfIn PDF document text
    • http://idealicaitalia.website/dragon_quest_9_remake_2020wguiv.pdfIn PDF document text
    • http://donbetosstreettacos.com/71011675232jasdp.pdfIn PDF document text
    • https://cdn.sqhk.co/padirazemi/YzvGEMp/wavur.pdfIn PDF document text
    • http://mattelipsticks.site/topup_africa_nairalandbrzy6.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/ihYjcJi/13281597913.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/rilexazejuzovep/specific_gravity_of_aggregates_lab_report.pdfIn PDF document text
    • http://benepuru.epizy.com/butyro_refractometer_manual.pdfIn PDF document text
    • http://pekopun.epizy.com/cumulative_flow_diagram_safe_information.pdfIn PDF document text
    • http://lapamapifutul.epizy.com/chapter_15_lymphatic_system_and_immunity_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/94391624713.pdfIn PDF document text
    • http://pupekafujobuda.rf.gd/55923418314.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/beginners_guide_to_the_endocannabinoid_system.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/aov_guide_zephys.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/14951622179.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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 5380 bytes
SHA-256: c37d2200746e0c6fa9a3c1ad8d46160e364a4df793a12d15a4806fec5b3d12f1
font_01_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 10212 bytes
SHA-256: e31306405b11632838cd5b20e403273e6c78fb8b4e5db629da0df272c3970556

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