Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d66f25f6f573678…

MALICIOUS

PDF

69.8 KB Created: 2020-12-22 13:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e07191fde49a6bdd1eca20a33f34cf5b SHA-1: d5ffe81c02a57de1fb96d6196a6e7c4702a8a88d SHA-256: 8d66f25f6f57367897fbf6d9c0da4bfa5c18e6285708d5a3c5bcef430ea2f40f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier output further support this assessment.

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://ggtraff.ru/strik?utm_term=short+stories+in+english+for+students+with+morals In PDF document text
    • https://rinavotonig.weebly.com/uploads/1/3/4/4/134477757/2608633.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/1200717.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
    • https://static1.squarespace.com/static/5fc28fbed26ff1194f7e5808/t/5fc5310a6457125654e3e2eb/1606758668592/garmin_edge_510_battery_replacement.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf464dcd9942793f27148f/t/5fcff6d13e94b40d0386efad/1607464658339/city_story_toy.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/parts_for_lst136_black_and_decker_trimmer.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/kosakeweruxanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac0b5ad-4ac1-4b74-8fee-648f6244daa8/regiment_des_zouaves_en_14-_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6950c7d5-ef3f-41a5-ba66-45597e81b105/you_ve_got_rights_icivics_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a91ad26ff1194f946019/t/5fcdbcda0ab5d62feb11f52c/1607318750039/bogajab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a25060f2895dc1f2fade/t/5fc5917d3c6ccf69f31e1a9a/1606783358820/xujobexatunodifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd6c1a40-6423-4bc6-ae6a-db493145b460/81273743405.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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 5396 bytes
SHA-256: ef61bbb6b3e706e9054ba73d95fd2fa0c9577553f64878945dfc70528da9af2c
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10124 bytes
SHA-256: a943e4f0439a37134019adf47fd9b3b13b28b40f8272e7f756fa6c7771fd6980
font_02_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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