Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b30adabbe79654…

MALICIOUS

PDF

67.3 KB Created: 2021-02-15 09:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 18faf3fa792d10ddbc8ab58bc26d2e31 SHA-1: 273425bfea0dc327d05fc8750f9717b0eca0eb06 SHA-256: 80b30adabbe796547930ea2351bd3e026a8e348491566bd6f151487896a9bc2d
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure ('Happy birthday hockey coach'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked URLs.

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/strik?utm_term=happy+birthday+hockey+coach In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6012b258d294f.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/xefijipokejese-wegexad-bamafexajuzev.pdfIn PDF document text
    • http://amsidisi.xyz/2635440943daq69.pdfIn PDF document text
    • http://stickerrus.ru/mosuzemizedovonojirptlg.pdfIn PDF document text
    • https://mapijilut.weebly.com/uploads/1/3/0/8/130873952/vapamezusi_wozositezulo.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/t8FDqib/natemisetos.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ucEuhhL/disney_labyrinth_game_rules.pdfIn PDF document text
    • http://govnososal.xyz/bosch_maxx_6_user_instructionsomi0n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fe1a2c954718.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/uhcTxhe/jaluvebajaxogijosad.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/4807475.pdfIn PDF document text
    • http://bigowet.xyz/81371921303tijy4.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/jokotaziweluge/jugonijodewigot.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/jixig.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/algebra_2_problems_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/4093958603.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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 5216 bytes
SHA-256: 3d69b3c75d170d6a52edbd940933a6935e1d20c8999370ed1a56dd33b75999d0
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 10104 bytes
SHA-256: f826e925fb2b3c9739dbba39c27292326e903c912c50ef0505b6f18d54f996c8

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