Malicious PDF — malware analysis report

Static analysis result for SHA-256 827a10812ee1eedf…

MALICIOUS

PDF

68.2 KB Created: 2020-12-30 23:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 555c4a9555dd4502b7bb0a4086462e6a SHA-1: 798cc496e31e7f3e2991bad2e1ccbb2ff1448c3f SHA-256: 827a10812ee1eedf62d3e00892be0f0a9815488b90cef56a080300e75e7c090a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (https://cctraff.ru/strik). The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to trick users into visiting potentially harmful websites, likely for phishing or malware delivery.

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/strik?utm_term=radio+commander+vr In PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/vuwevux.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/jeghk3F/wild_west_escape_room_oxford.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/kalubegimexu_kivojuxutoj_woletefakos_xisomumi.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/zgj0jbt/euro_truck_simulator_2_dlc_ukraine.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/jeDigDr/yeezy_supply_350_zebra.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/bumexivitagos.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/3817765.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/6034297.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/3679118.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/3110500.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/banula/71652312151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893bf584-820b-469e-ae47-c160bb3ef8d6/bonus_winamax_1er_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/misbahul_lughat_arabic_to_urdu.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_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 4944 bytes
SHA-256: 6ebc50675f86eaca9bea06edfcc33b036e14e3b153086d7e40d6ba2c0fae251b
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 11284 bytes
SHA-256: 03d1d1d5bb78318129b3b5ecc1ca04ddda4af6e720364055bc211dd03b3c34b5

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