Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3a10486efdedca…

MALICIOUS

PDF

91.9 KB Created: 2021-01-03 07:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e2ec5bc372ee04ccc1838276c0313162 SHA-1: dce64a1bf875fb892376ef696f8905107ebd37a8 SHA-256: da3a10486efdedcadce5ae5def9db1afdb6e9811e0db75ddc3115b6e4b83da2a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document is designed to drive traffic to malicious sites. While no scripts were explicitly extracted, the presence of numerous external links and the ML classification strongly suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffe.ru/123?utm_term=heat+and+mass+transfer+solutions+manual PDF link annotation
    • https://cdn.sqhk.co/tivuzofep/iHgiuWN/eternal_card_game_deck_building.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/J8UqZhh/nawosemepaxuvivevi.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/IpG5Ihc/12420166565.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/AibKjia/60506051062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fafd1b370f69.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/vovuzize/rivaxabive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302a71c4-b767-4481-a55f-be71fcd1180e/borderlands_2_chain_lightning_farm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75afde92-f93e-4749-b4fa-59651ebeed27/toledo_public_schools_calendar_2019_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c97c268-d96a-43d2-80ac-4f7f4ba4508d/68722460934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76f56ab-7a88-423c-8dc5-68421f85a1e1/kuzukokizanawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede444ab-9c7d-4f55-9c42-a7ce9428b0bc/gutavavomixufifo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 5012 bytes
SHA-256: 4a85091c7f23c5adea7d76923d8238aeac84986e76c2f39675c1488aca5b30a3
font_01_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 12032 bytes
SHA-256: 0d0d44a72d15266e26e55c79ebb01b8364e20f9c74f2569009ea644e769c8d43
font_02_sfnt_off00014c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6C 16324 bytes
SHA-256: 39abc796934fbafce173bee0233a8e942e6b2b6f22a635e68c0947c3015a79ed

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