Malicious PDF — malware analysis report

Static analysis result for SHA-256 12766bb8257687f4…

MALICIOUS

PDF

80.2 KB Created: 2020-12-18 12:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a870432ce4440e9518e8e6769ddf6e10 SHA-1: 26752d2af198cda2b3c888c473d6e3a89a5f329f SHA-256: 12766bb8257687f49319536317af37f516715ac4eeb0a648d2190ffdeab4f01a
254 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on link farms and redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are intended to lead users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous outbound links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=relative+clauses+lesson+plan+pdf In PDF document text
    • https://duzikasaropofe.weebly.com/uploads/1/3/4/4/134489835/pagikobapev_tesakepuwazeg_gomofejevob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f8b318854a50.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/xebopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f92477678b7f.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/4163004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_5f9f77a4588c5.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/potepewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5fd3893a8e566.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/7a574d1a-da68-43f6-86e6-0e2b82bf3ff9/devil_may_cry_3_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9740f8fb-19a4-4883-a778-2c41480c2eb8/99575855369.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57a2a1452f90b7f03fee5/t/5fd72f02164d0f203c95eacc/1607937794450/fubifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72f3957-94f7-4b35-a605-0532ff0b91a7/jackson_supply_company_online_billing_address.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd27f3b27fe04e621ada96/1606232054209/76052163580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dcd9a1-9bba-4b70-ba9a-57193bcb13a6/banevikasog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db422cfa-ac06-4eec-a3ef-40f79b00a0c7/little_miss_books_read_aloud.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_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 5120 bytes
SHA-256: c3ae04f5e267f92ae4b8061e0a4fcd735cf40bada39d37ee5156d5d19940696d
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10844 bytes
SHA-256: fcefd93fbc0ca965b9d3c22515dc6c5cbd6bafb8f71d87804cec49babc7a64e0