Malicious PDF — malware analysis report

Static analysis result for SHA-256 a534f6bffac66464…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 17:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0df087e1248b87cb5fa9678840817781 SHA-1: 22c52e92ee9795a14e1bc81099ab5b33d534b4b9 SHA-256: a534f6bffac664642d0c0fe7a6e54b7fcd4980084f2be696cd344b37021a01a7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate documents. The primary URL, https://mezovuduw.ru/award?keyword=synthesis+of+peptide+hormones+pdf, suggests a lure related to scientific synthesis. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or scam attempt using embedded links.

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
  • 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.
  • 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://mezovuduw.ru/award?keyword=synthesis+of+peptide+hormones+pdf PDF link annotation
    • https://sofeparevik.weebly.com/uploads/1/3/4/5/134517226/8280224.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/1bf4454d2e5.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/3133735.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/7417810.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/vavabi/talevebezojulileteniwag.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/73699318416.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/makerere_university_post_graduate_application_forms_2019.pdfIn PDF document text
    • http://gipenebome.epizy.com/92234648983.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/dijarolofabugimoriminada.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_40e7ed99038e4020b6da17d57949b517.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f91189-5e68-4b6d-b257-ec54a7c8e502/5380415858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23ffade-f9eb-40cd-af50-7d4e6fbf04f1/best_free_logo_design_software_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b7e077-d550-4e4a-8b43-e65af9ccc2d7/how_to_setup_pi-star.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725dd80c-eb7b-4ba3-b490-fdc14b371eab/99274874473.pdfIn PDF document text
    • http://giwitevezupe.rf.gd/how_to_crochet_a_blanket_for_beginners_step_by_step_video.pdfIn PDF document text
    • http://zaximibirada.epizy.com/electric_current_class_10_ssc.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/74084846094.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5244 bytes
SHA-256: e8f22cba37df88ac4a069db55f6e144083bd204aa7c156222ab4e12a52b18b44
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10772 bytes
SHA-256: f103bd02f19ecc38e87df5e8a801bb83078332169e905c8da6c8fa89755ab6a3

Open this report in the interactive analyzer, or submit your own file for analysis.