Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc65820541fc753e…

MALICIOUS

PDF

85.9 KB Created: 2021-02-27 22:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7467b861a7c90c453740f7e90fd94c0c SHA-1: 8eb604a33c9c4abd65cd2f5fe9992dc2880894c5 SHA-256: dc65820541fc753ea4346a070c89694e0c962f40c0a4447ce845e6478770e173
186 Risk Score

Malware Insights

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

The PDF 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. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=how+to+write+a+strong+analytical+essay PDF link annotation
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/99a4e2d483209.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/xavigi-mizos-gozovewu.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/af10a52eec8.pdfIn PDF document text
    • http://ludokebisiw.iblogger.org/mivofu.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/084b9e8a3933aa6.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/5956257.pdfIn PDF document text
    • http://goodsun.fun/15981491322p7t9q.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/0ab555fd1612.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/53695516863.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/jaferiwakokupi.pdfIn PDF document text
    • http://likozibave.iblogger.org/fimivit.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/81895376708.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/vugur-mujutu-jalew-puwugopo.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/valuvefojoxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weparaxopulo.atwebpages.com/how_much_do_navy_seal_officers_get_paid.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/91477983958.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/how_to_connect_a_brother_printer_that_is_offline.pdfIn PDF document text
    • http://sosozodazu.epizy.com/gitowupavinaxudexutekulul.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 5124 bytes
SHA-256: 04c56eb0cf1f90b5302d67110f27cae5adb5305f5b9221852797fc956df9bd32
font_01_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 10376 bytes
SHA-256: 95e0f67e74b1a7d98c70524d449b3006e5c5d7d48dad06cabccecef14c2f9c52

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