Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e2621a9b90e7dc…

MALICIOUS

PDF

79.6 KB Created: 2020-11-17 18:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 247cb8a617145158bc968d1b04f35820 SHA-1: 2e9cf6ca165612114851e0de1091d889e8d3a097 SHA-256: 63e2621a9b90e7dc6c858c10e63bf77a4ae0097cf08a855dc0d1cd66eeab3696
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on Weebly and Strikingly. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=vintage+tappan+stove+manual
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/1034555.pdf
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/gumamabido.pdf
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/sobanovab_zenufetedolal_nanibidiraj.pdf
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/zafosejo.pdf
    • https://wogilaxafa.weebly.com/uploads/1/3/4/4/134479860/dewebetalagubu-jawunabulifi-nezegezi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02e52ce4-2098-407f-8b4d-5d65c35c14b9/potuxegifeterozewumudi.pdf
    • https://uploads.strikinglycdn.com/files/55ca11e4-eefb-4bad-9256-860caed04c12/tozexozotan.pdf
    • https://uploads.strikinglycdn.com/files/1d8682bb-6a50-42e7-9ddc-ac4f6ee0bde0/59627539073.pdf
    • https://uploads.strikinglycdn.com/files/9ee6add1-a9e5-4b1c-a332-2868a996c1d1/20518298326.pdf
    • https://uploads.strikinglycdn.com/files/90e39406-fe84-498d-b72a-41182641657f/nurabomipetewaxipobeluj.pdf
    • https://uploads.strikinglycdn.com/files/5459df95-1149-4b65-93b0-c9a8016f06fd/vibigo.pdf
    • https://uploads.strikinglycdn.com/files/696892b7-c059-4a89-a408-538053ce5068/8_prayer_watch_hours.pdf
    • https://s3.amazonaws.com/wilugugo/newtons_first_law_review_questions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin
14cdbc908cb47f54f32197b2d44a4089a004d3495ac0d7056f67424e2c553920
pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5068 bytes
font_01_sfnt_off000103b4.bin
8e7c8edcc86340d2568ae4b78c3e368d21557ac0f70765a7dc02b08f907abc23
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 14780 bytes