Malicious PDF — malware analysis report

Static analysis result for SHA-256 7654f24bc569e651…

MALICIOUS

PDF

72.1 KB Created: 2021-01-20 09:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7526b8008ef60994800d82715e8909fc SHA-1: 04b228341278b3f18b0fe2167f35535e6f254900 SHA-256: 7654f24bc569e651808a02a360ae5c98b508fc4036c51c0dc09a80b076beafbe
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs and the ML classifier output strongly suggest a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=go+kart+chain In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5fa5bd48b550d.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/dijHIhc/fear_the_walking_dead_episode_13_season_5.pdfIn PDF document text
    • https://cdn.sqhk.co/rusukumuva/dsqjeji/vuvufoxaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5fa739e904e46.pdfIn PDF document text
    • https://site-1177769.mozfiles.com/files/1177769/skull_wallpaper_iphone_7.pdfIn PDF document text
    • https://site-1168481.mozfiles.com/files/1168481/brick_making_business_plan_example.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/hj0ja8f/secret_codes_for_android.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/play_store_app_update_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_5fa7368acd91f.pdfIn PDF document text
    • https://cdn.sqhk.co/gonaxetuped/T7MROha/86343805426.pdfIn PDF document text
    • https://site-1174504.mozfiles.com/files/1174504/beck_hyperspace_review_allmusic.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ribifhd/41800200551.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/jeagdie/ski_jumping_games_free_download_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409239/normal_5fe32d679d6f9.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/felugetixi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 4772 bytes
SHA-256: 152ba25f861af3d1452a4fd7f9df71a61fc5444e63e14f66df7a6b8ee4f21fa0
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10476 bytes
SHA-256: d393023242aa6428b7952f6e5453d68a456b1b5bf22920760992e845fdf904f7

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