Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2553794d549e469…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 02:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b68dec1dc34cf92ec7cf4cafd1673f81 SHA-1: 6c7f8b22991f425604cca6ac2dc8645984bd03c4 SHA-256: c2553794d549e46939365bb1cda4e403910fa6568d2d8dcc0d02cd9fad0dcd4e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://zajinet.ru/strik?utm_term=spanish+medical+terminology+certification PDF link annotation
    • http://buyfastedcircle.xyz/chamberlain_universal_keypad_home_depotz5bnb.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/baf53e7a87.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/vubosuxigitesirijupojuve.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/eXgeWR3/9630804879.pdfIn PDF document text
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/118a76c11f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451756/normal_600cefe83e898.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/bOgjjig/siwururu.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/hdIOeFn/lettre_alphabet_wolof.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/56827634484.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/3655772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_6058b458c2393.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/wujukerivez.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/renovimebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fef8e5e962a1.pdfIn PDF document text
    • http://segwaywheelchair.ru/resumen_de_el_libro_un_grito_desesperado74fl3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_604b539a62659.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/bujif.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/sazariwapa/lexebuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/bupidalofirixosobirefoved.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/20008557344.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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 5776 bytes
SHA-256: 10aae576dca2a3cfb5e0b93968643fc5e8a5cb6b3a14fe61007b84e4bafc7a40
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10376 bytes
SHA-256: 977882cdda4e2886ec8466b5c3387cb8e16896edda3b81bab674ab40809a63cc

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