Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16f8a3df1568552…

MALICIOUS

PDF

63.8 KB Created: 2021-01-14 22:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8075faa87472e8acfe5c3a4267241d64 SHA-1: 9d4e4a6aebe704970a4b4db775ab36bcdf552b2e SHA-256: c16f8a3df1568552f224fc56140a444308731130df2d80444c36315b6e83e934
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gettraff.ru/aws?utm_term=airline+industry+trends+2018+pdf In PDF document text
    • https://cdn.sqhk.co/wesurewilo/fm6Tgha/star_wars_droid_tank_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/ghhhikI/tanglewood_golf_course_ohio.pdfIn PDF document text
    • https://site-1171599.mozfiles.com/files/1171599/70221873604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5ff69933dc40c.pdfIn PDF document text
    • https://site-1175416.mozfiles.com/files/1175416/rabonipanarugasudonukalez.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/4660986.pdfIn PDF document text
    • https://site-1084296.mozfiles.com/files/1084296/kusexidimigiragomotofuk.pdfIn PDF document text
    • https://site-1172077.mozfiles.com/files/1172077/microsoft_online_translator_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/hgjhogc/57540449133.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/jhfmicb/ps4_emulator_hack_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fb81bec85d70.pdfIn PDF document text
    • https://zezazuzomej.weebly.com/uploads/1/3/1/0/131070861/pigamazope.pdfIn PDF document text
    • https://site-1168233.mozfiles.com/files/1168233/vuremagis.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/masevewi/3588219587.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/2018_content_calendar_google_sheets.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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 5436 bytes
SHA-256: 64eea88f9a8f80895e61bd30f4f0e4b3eb1f2617a3b816e8bade68bb3cd0572b
font_01_sfnt_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 9760 bytes
SHA-256: 39b6d0f792d1e331b690c30747db3f7fc392120a465f11c3327f439c8c77dc9e

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