Malicious PDF — malware analysis report

Static analysis result for SHA-256 7345b53e438d40a7…

MALICIOUS

PDF

78.0 KB Created: 2021-02-27 16:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 436755de704b135bba06a0d03509d9ef SHA-1: f43d42a1a7a51eeeae8f87d66c9c99a6581600b2 SHA-256: 7345b53e438d40a79c2de5d54539ba9da03d34b37e97bd2145f08d90e9709b1b
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a technical query, designed to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://lozipotod.ru/123?utm_term=how+do+i+fix+the+chimes+on+my+howard+miller+grandfather+clock PDF link annotation
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/eea67.pdfIn PDF document text
    • https://jitosagar.weebly.com/uploads/1/3/4/3/134318128/8522330.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/87049187843.pdfIn PDF document text
    • http://zasasalusip.22web.org/defining_relative_clauses_exercises_with_answers.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/9206462.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/59883802055.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/8327a715.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/67f68d8.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/potosepaxareme-gigoxina.pdfIn PDF document text
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/suguwupasimafofune.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/NhdKjhv/47422349288.pdfIn PDF document text
    • https://cdn.sqhk.co/momebuman/jbghjeY/thoroughly_meaning_in_english.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/what_are_the_five_elements_of_romanticism.pdfIn PDF document text
    • https://votamonaf.weebly.com/uploads/1/3/1/4/131452952/dinanunuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetulugesoboko.epizy.com/68417574589.pdfIn PDF document text
    • http://leribilif.rf.gd/foxuvovizofibevawanenos.pdfIn PDF document text
    • http://sitiwaruto.rf.gd/nubatodeveseku.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/61967298120.pdfIn PDF document text
    • http://navasegekukuj.epizy.com/anisocoria_en_gatos.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_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5724 bytes
SHA-256: 27ecaff3cbb75779519e535310cda9c54ac25566ef8e12d3fad92165a2d55573
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 10272 bytes
SHA-256: e420e0f74255395d2754703dd7ce6f43d1a117e172d34c3c36c385d72d2fd627

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