Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9dc9dace3a8978…

MALICIOUS

PDF

71.5 KB Created: 2021-02-12 12:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0399e80cd82de9d9e601e18279fdbfad SHA-1: 3d922c25175811efef54411b4344f3ef85ab0a49 SHA-256: 5f9dc9dace3a89783c72520adab101370371830aa6515a5fc64a931df111c2ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm designed to host malicious content or phishing lures. The presence of multiple PDF_SEO_LINK_FARM heuristics further supports this, suggesting an attempt to generate traffic or distribute malware through a network of linked PDFs. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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
  • 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.
  • 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://maypoin.ru/123?utm_term=science+state+test+grade+8+date PDF link annotation
    • http://pefuwujoxuroj.iblogger.org/22716206088.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/27181c4d102644f.pdfIn PDF document text
    • http://study-english-05.site/amar_prem_film_online_gratismk96a.pdfIn PDF document text
    • http://thrivewebs.com/dukopuxagonikenotio59m5.pdfIn PDF document text
    • http://gufosizikok.22web.org/46381505823.pdfIn PDF document text
    • http://azorocheat5.xyz/fazavojukipiwu9hze9.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/zoxejav.pdfIn PDF document text
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/vetediloxuk.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/3010772.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/4197524.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/voxakajobef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debalipusafuj.epizy.com/zalupamavodom.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/vukobevaginipirupizavika.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/18757909112.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/bubble_shooter_sea_saga.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/mapleroyals_training_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/vukewexezuxuba.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/nelefomure.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 5372 bytes
SHA-256: 4d0815dfbf926282a04c8010b3182e4adda2512b688d8d41c3dd0d053c621397
font_01_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10480 bytes
SHA-256: 01d97c45fa9a380101113c0be5d37b940bdc6da7e2df573b9eb97c21cec65368

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