Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cab0020f62a2fd…

MALICIOUS

PDF

84.8 KB Created: 2020-11-18 21:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e448a138610ec9891adc2adcd33dc8f1 SHA-1: b991116e95234452b0f6f530600b1e219af7e100 SHA-256: 81cab0020f62a2fda64fbd171d3105b9eca753298afc73060f51badc3a6fd5c6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is weaponized to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/strik?utm_term=the+pigman+and+me+excerpt In PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/jajitum-duzuraledut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5f986f536b01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f892bfe868b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5fa1b436cba32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5faedbe0a3019.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/0fac48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f9aa700aff74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5fabcc73a8357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8d6879-d9e1-4adb-b829-2014616f3fe7/nba_2k17_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b47455-0571-4394-aebd-acfa68979168/61311577731.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000118fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118FB 26220 bytes
SHA-256: 862a98517bba2dd4c9f5f81dd7b543252f7ead653bee0f7619df7c23a3938f8c
font_00_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 5292 bytes
SHA-256: a96ac0b108aa315bed0f453ff66f4cba9db16de0042c153de688d55dbc3ea255
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10968 bytes
SHA-256: 22dc016200b3705232641d7ad6412b59552329cdf9ae4dc15fda7c656d98d668

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