Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee55e648c4fbba3…

MALICIOUS

PDF

76.0 KB Created: 2021-06-06 05:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b102766cf2ca3cdf69da6f7976012df1 SHA-1: d30c8fb2d1eec62f21cc7d136f86170a3613a9c6 SHA-256: aee55e648c4fbba3b741b35f3d5cf1b07372eb0a6bc44e974590b8d36bb7ef2c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://chcial.ru/pbw?utm_term=can+i+play+sports+with+scoliosis. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://chcial.ru/pbw?utm_term=can+i+play+sports+with+scoliosis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5feb40586fe8f.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/7082182.pdfIn PDF document text
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/xogunigivon-limexugep-dinina.pdfIn PDF document text
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/lolegitifidaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5ff08a7dda261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_60353c2a09b10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_60690c9252e14.pdfIn PDF document text
    • https://sazukigozozabep.weebly.com/uploads/1/3/4/3/134310948/2358862.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/8191834.pdfIn PDF document text
    • https://lemapola.weebly.com/uploads/1/3/1/4/131407815/tidopetodanef.pdfIn PDF document text
    • https://jiziweradufib.weebly.com/uploads/1/3/4/8/134847172/lusibez_linixometebadi_xunavimoloteros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6041d98c18d15.pdfIn PDF document text
    • https://patodenum.weebly.com/uploads/1/3/4/6/134657208/ce4bdc7308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bd29ee-e34a-483e-af85-4f274da021de/cunto_tiene_una_pulgada_en_centmetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3b9f37-6f3f-4990-8db8-37d94c05edd7/the_lord_of_the_rings_deluxe_edition_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aba91b2-0286-492e-8e7a-01aaae98f021/remington_700_vtr_308_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1b3f35-5448-4c20-b393-c2d7c92cd446/shadows_of_brimstone_forbidden_fortress_character_sheet.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/does_asta_turn_full_demon.pdfIn PDF document text
    • http://sonubugu.pbworks.com/f/jilulowebozeluluxukiwep.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144461373/rijazanexaxi.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/harrington_plastics_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3934b808-2bff-42e4-abb9-6acb43d7f439/how_to_use_a_jump_starter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db45297a-71e7-4e86-99f5-c84ae40c6e94/how_do_you_write_a_good_advertisement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1db207-1e10-4414-9b7e-562154ec2253/zubovomosuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba70dae-2416-46a9-bd4f-235613888d4e/which_certification_is_best_in_aws.pdfIn PDF document text
    • http://xugatun.pbworks.com/f/7855244403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6136b5-c863-4325-91da-e11c2e79bd64/how_to_change_the_schedule_on_honeywell_thermostat.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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5120 bytes
SHA-256: 6ce685cde5679748c18a5585731bc68b5f933564f0f6e13cd594fd928c8cd5c4
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 11360 bytes
SHA-256: 3ca8d6930045105e34dca658e408475617ca218c93e596adfff8766437b5ffc2

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