Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e5a98f46fc04cb…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 19:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa0fbfe991cc67459eb40dacb1f3a4c4 SHA-1: d24fe58d1d42234a5671410a923bf3de48ae397f SHA-256: 27e5a98f46fc04cba193f608ca5b6a38acd319fc7881c8265e42e0c69bf868eb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=2020+calendar+pdf+download+with+holidays PDF link annotation
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/lafatenijan.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/S2OnaQ4/difference_between_double_clutching_and_rev_matching.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/5434370.pdfIn PDF document text
    • http://vikotafatekim.iblogger.org/best_app_mind_mapping_ipad.pdfIn PDF document text
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/78bd2ee8d2ec.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/jicijhh/83442884224.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/8echwii/traffic_rider_hack_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/sgeMiiM/nadenenefarabupufe.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/9077096.pdfIn PDF document text
    • https://cdn.sqhk.co/jinatopa/tg8Wif1/aprendizagem_e_performance_motora_resumo.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/iGlC70X/71606973282.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/musokejixami/3878674323.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/buwukiduzamuf.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_912f36dfb59248b99fc97e5a59e3635b.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_00d68179c45e4559a6820988c527bc93.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_2b89ac16c4544348b5438717618e325c.pdf?index=trueIn PDF document text
    • http://xatenekoroxaju.epizy.com/77089885291.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_1e69bb88503c47f5aeaafeab0bbe7360.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_70bbf570ad7f4d2d99bf8beb425a9dbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/organic_chemistry_dictionary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 5616 bytes
SHA-256: efbcecd27fc4e56cd9b42fe04cd1602485f57a82be37499723a43d8c260481e9
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 2292 bytes
SHA-256: 0768a9456ef989022cc8067abf08e22131d20cc729927cbb6294952cc648c34b
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 12092 bytes
SHA-256: 0c420f571016b491942924d56c869f3f8e9a81df0d7acbbeef0ef53a875d7c74