Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd4546f5b794b2a…

MALICIOUS

PDF

64.4 KB Created: 2021-02-27 22:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 246e150eec85627ef492d99275c3d862 SHA-1: 690933a4c580cd5c9485b2823c85ea51e15f264a SHA-256: 1cd4546f5b794b2a96fbb365e872f0aef8a393f09f33d9351355086dc37c3358
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains multiple links to potentially malicious or disposable hosting domains, including a primary redirector at 'https://yafferge.ru/123?utm_term=photoshop+7.0+shortcut+keys+in+hindi+pdf'. The document body, though heavily obfuscated, suggests a lure related to Photoshop shortcut keys, likely to trick users into visiting the malicious links. No scripts were extracted, but the presence of redirector links and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=photoshop+7.0+shortcut+keys+in+hindi+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fd9a0afd6ade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_60094fe1cc9c1.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/RWImJYr/88456518106.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/zerako_wupasejepopuk_vogipikipumibu.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/aXjbyjg/11973737161.pdfIn PDF document text
    • https://kitipodowenin.weebly.com/uploads/1/3/5/3/135383326/lewexoronagutijizebe.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/njePNjc/95736191187.pdfIn PDF document text
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/rogorepijavu-mevugevewibo.pdfIn PDF document text
    • http://gomosivuniku.22web.org/zubededanaderedopujozufi.pdfIn PDF document text
    • http://rudexikuritisi.iblogger.org/setc_bus_game_for_pc.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/how_to_reset_dish_network_internet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopiwutipav.epizy.com/double_acting_pneumatic_cylinder_datasheet.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/que_debo_hacer_si_un_familiar_tiene_covid_19.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/iupac_naming_practice_worksheets_with_answers.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/bsc_interior_designing_colleges_in_mumbai.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/alfred_adler_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/11681671848.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_off0000c1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E5 5424 bytes
SHA-256: 2c87c90dd211cfffd65c562a9a15545db6f1b1b5f1b2606a6a8f61bbc970215c
font_01_sfnt_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 9412 bytes
SHA-256: e95375c4d207eed2015bf5c4ec66eb60b16086b8931fe50f37412f1512299b59

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