Malicious PDF — malware analysis report

Static analysis result for SHA-256 629f892d831271e0…

MALICIOUS

PDF

68.1 KB Created: 2020-12-21 17:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5b7c3afafb0e723a76e5cd15dfd8f343 SHA-1: 380f5bd623019abfba66d536e83a026de2f009f3 SHA-256: 629f892d831271e07f9e51ab9df0e4de58ef8b321d2d6852e2bfd5b1446cb1b4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=canvas+student+ccsd In PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/8675016.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/f9282.pdfIn PDF document text
    • https://zitilegog.weebly.com/uploads/1/3/4/5/134501444/gobojelof.pdfIn PDF document text
    • https://lisokafi.weebly.com/uploads/1/3/4/6/134694643/wobobubotad-xofoferigiw-vodurebemiluj-bufesu.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/e6e196ff7953e1.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/sikudexit_jegewewukaw_webib_negijizukit.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/tajimipojimo/cirrhosis_guideline_thai.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/jaregulavojejizusuwofi.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/aha_cardiac_arrest_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/acog_pap_smear_guidelines_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b8fab9-a85c-4a9e-91af-a14ebda9cebd/judgement_day_intelligent_design_on.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_off0000cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 4772 bytes
SHA-256: 00fe0707ca614de6651b43c213704b96112a11ece22aa163b2b72b40500b74a7
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 10756 bytes
SHA-256: bc1632d854ead4c795df7244d012f0f58803c6b91e8e72ceee19cf9c10383d5c

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