Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4476e71688b0e7a…

MALICIOUS

PDF

81.3 KB Created: 2020-12-26 09:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf777ba88f54221fc0a50ef10d09723 SHA-1: 1c95019a1ad52741e5095e025e2e64ba9d5ca069 SHA-256: d4476e71688b0e7add6eea705f2628609d48f945552783dfaa391ee032fb3447
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, and one critical heuristic indicates it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=best+manual+die+cutting+machine+for+fabric
    • https://cdn.sqhk.co/talidapato/3hejecZ/undersea_cable_bandwidth.pdf
    • https://cdn.sqhk.co/solumapidema/idgCgdB/download_f1_mobile_racing_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/faxiwapa/hchhjdu/44799862506.pdf
    • https://cdn.sqhk.co/berovanova/Wjd6JSh/covid_alert_nj_reviews.pdf
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/noxusokaduruwo-mijuloxirifon.pdf
    • https://cdn.sqhk.co/nogedapuvul/ijfmiff/xovodinufupuruneri.pdf
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/xenonovatixexivoni.pdf
    • https://cdn.sqhk.co/latipizi/SDM3Wjw/7477113355.pdf
    • https://cdn.sqhk.co/xumobopore/bjjjjdY/field_hockey_training_drills_australia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ce3d451c-f347-4f11-b7fe-a789c8d64351/7_levels_of_communication.pdf
    • https://uploads.strikinglycdn.com/files/610c4447-fa20-4509-938d-b43b26fd8c5c/keller_williams_bold_schedule.pdf
    • https://uploads.strikinglycdn.com/files/8d6a22cc-75d2-4f62-8dc2-989782be458f/principal_parts_of_manual_typewriter.pdf
    • https://uploads.strikinglycdn.com/files/af547731-401c-43c6-af37-623737c92b66/dirizadorufuji.pdf
    • https://uploads.strikinglycdn.com/files/d6735006-8cfd-4dcd-9edc-248185eb52a2/van_andel_arena_seating_chart_view.pdf
    • https://uploads.strikinglycdn.com/files/29fb590a-6f0b-46e4-8a02-3c42a10a355b/jinofakovozafo.pdf
    • https://uploads.strikinglycdn.com/files/9adf0e58-f33f-49a7-be50-d74f51afa7cd/41041788407.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14c.bin
1e82d44698547bf97c3489c72707c76a84443c7618b2c3d8f9204d3b717c8406		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 5508 bytes
font_01_sfnt_off000103d0.bin
6e83a3b181a7b52dd9958c171b3d6aa05a56bb6e8cb98d8ae4bcc8699e739dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 11140 bytes
font_02_sfnt_off00012967.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 4324 bytes

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