Malicious PDF — malware analysis report

Static analysis result for SHA-256 74deb5c0422d671c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 01:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3c62e9655be75f6006f036d3733130fd SHA-1: 20b924abf186110acb3d36dc285160205918aa5b SHA-256: 74deb5c0422d671c2b5a5e32cd7fea75e086e50d50ff0b594da6cbc51d2c9fa5
214 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 for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external malicious sites.

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=dark+weapon+vs+resonant+weapon In PDF document text
    • https://cdn.sqhk.co/manaruparil/fChcLb1/jusopem.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/ij5yhjJ/61812515.pdfIn PDF document text
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/03e02fc6c0081.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/wejevap.pdfIn PDF document text
    • https://detaseruwef.weebly.com/uploads/1/3/0/7/130740376/1769823.pdfIn PDF document text
    • http://latujor.22web.org/acdsee_5_free_for_windows_7.pdfIn PDF document text
    • http://gabojodidi.iblogger.org/wiwufoduzimi.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/kodipopujufipig/bivunezirurif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399f7a69-644c-441c-afd9-7c38d814777c/paton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9873fdde-c263-48a0-9f46-72d797c0b740/how_many_polar_bears_have_died_due_to_climate_change.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/cambridge_book_9_listening_test_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/70683757002.pdfIn PDF document text
    • http://fesamemosonug.rf.gd/48550932297.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/fozikodejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ec82eb-dc84-4cd1-a255-2aa951876edd/fuenteovejuna_english_text.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/gahanna_oh_police_reports.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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 4996 bytes
SHA-256: 51cb7bd60af49058ca68e86f791606c431d1e40b859ea55e168fe43671c03821
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 11120 bytes
SHA-256: 54a891e45fea5365184e34dc3eed028760d1463949d9f0512ae975290615822e

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