Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d4d0069e3fa2f1…

MALICIOUS

PDF

66.3 KB Created: 2021-01-11 20:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 470e7c11267b09c5b661fb8436e71dea SHA-1: 77152f2024ea3fc2197a3406c770a4cd5ac8c059 SHA-256: f1d4d0069e3fa2f125834a13469f97973e749a3d6f65e7c7819d4b1c45c5f03a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'user manual', which is a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving directing the user to malicious infrastructure.

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
  • 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://ggtraff.ru/123?utm_term=td-v26+user+manual+pdf In PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/mitizimelidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_5f977da7cb0ec.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/8010469.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/mini_motor_racing_mod_apk_android_1.pdfIn PDF document text
    • https://site-1198654.mozfiles.com/files/1198654/werow.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/alan_hangover_costume_diy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f902ede107a7.pdfIn PDF document text
    • https://site-1197330.mozfiles.com/files/1197330/virtual_friend_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/agjific/45361886762.pdfIn PDF document text
    • https://site-1207164.mozfiles.com/files/1207164/drawer_runners_heavy_duty_uk.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/xesigeze/44570063746.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/counting_numbers_worksheets_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/yu_gi_oh_forbidden_memories_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/93797319739.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/walet.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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 5516 bytes
SHA-256: d2d08a4ad534e685a761e677f32caae99d428cd63b7e049768d3eea30d82aa5a
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 10648 bytes
SHA-256: 8912110b798e544081abe4e44fe4ad766798b1f2a85d45e39379d2a8fb14294f

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