Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb64445275425ecc…

MALICIOUS

PDF

84.7 KB Created: 2021-03-12 10:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d76feec42b8b6276c7be93ef00d7ebc7 SHA-1: e22462400c46703cc30b0f2d18fe9a513ca52e76 SHA-256: cb64445275425ecc7d205edf2949c9904f3e4611bbee082fa0e412715a3f37de
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a medium alert for being a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded links, such as https://yafferge.ru/wix?keyword=manual+magellan+1100i, are likely used to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=manual+magellan+1100i In PDF document text
    • http://shoppermarket.online/wavelet_headphone_specific_equalization_pro_apk7x0ao.pdfIn PDF document text
    • https://cdn.sqhk.co/memukodafum/nNXLid6/merefumagozijat.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/nqific1/merchant_of_venice_characters_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6026f3593192a.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/3ihheyD/pacify_her_clean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6016de9a5d599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_6026585995755.pdfIn PDF document text
    • http://prizinsta24.site/7381811671319em0.pdfIn PDF document text
    • http://2gusevshop.space/escape_from_mr._lemoncellos_library_movie_cast0dcaj.pdfIn PDF document text
    • http://kulinar2020.site/sezulfkgg8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_601db43a42bf4.pdfIn PDF document text
    • http://wildber.store/monstrous_synonym_atrociousw1kyr.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/bqelidE/fibovikile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_600c87a3dc765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6015dc7aa5276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fee1ba0d574d.pdfIn PDF document text
    • http://olipaka.xyz/1171577673203sgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_604a374bcdc7a.pdfIn PDF document text
    • http://mebets.xyz/higher_engineering_mathematics_by_hk_dass9pqtp.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/tolivajupeku/6495570161.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/womens_black_lace_up_platform_booties.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_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 4932 bytes
SHA-256: 6e3a9be5e6a4e020761f7b834006c5ccc99d913cdce9fdbddafb2cd04af505b2
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 10548 bytes
SHA-256: 48e681c123d3aaeef0baa24e6e04ffce0864ed4aeb1fb8ab24394c9c5e8f7da0

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