Malicious PDF — malware analysis report

Static analysis result for SHA-256 426cfdc6729d3e7d…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 03:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3f2c295f947347666cd25731c90afca9 SHA-1: 646fcf8007522ce7ca285493f781f62befdef960 SHA-256: 426cfdc6729d3e7d54461a282bb4a6a0d9d0626577c0e17832158d742306c2ba
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of malicious URLs and the document's structure suggest an attempt to redirect users to harmful sites.

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=multiton+pallet+jack+m2748+parts In PDF document text
    • https://cdn.sqhk.co/kululojilo/EtijGCN/44734442527.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/gcijVhj/woodturning_lathe_for_sale_south_africa.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/jim_croce_guitar_songbook.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/jc3Uyhf/1886954436.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/jam2_speaker_pairing.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/xafeborarenujesun.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/vurinenupevedibiwesajo.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/ihcgchq/thorax_human_mlp.pdfIn PDF document text
    • http://bewepovuzif.iblogger.org/59336941087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dobejevilorizu.epizy.com/la_la_la_song_bazaar.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/cisco_networking_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/82826360975.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/forgotten_realms_series_order.pdfIn PDF document text
    • http://jokosen.atwebpages.com/how_long_does_it_take_to_learn_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/9152760118.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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 5600 bytes
SHA-256: f6599ea4eaa90c0951db243d0ff6c91ef8418c1d0ab108b000b42ecdc895c080
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 11312 bytes
SHA-256: ff67abda89fa74bd3010da654a8c2c2d39d44cd698f41c6facd53cedcf52535a
font_02_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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