Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e2b8873728061c…

MALICIOUS

PDF

71.5 KB Created: 2021-06-05 14:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 18381fa7106309c3a9eee1016eacf5d1 SHA-1: 3eff45cc9f4de29bd0f2a76e472dcee2c9cf6fd6 SHA-256: 66e2b8873728061ce91d8e5afa8035e7bbe20061705e80767732642cf0cbf351
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary attack pattern involves directing users to a network of potentially malicious or SEO-manipulating websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/pbw?utm_term=what+is+problem+solving+model+in+social+work PDF link annotation
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/6984126.pdfIn PDF document text
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/3943219c9caa231.pdfIn PDF document text
    • https://xemubafuwifo.weebly.com/uploads/1/3/4/4/134475424/duvuxig-logemiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nidibewuzi.pbworks.com/f/rekasewalusa.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/why_does_my_bosch_fridge_keep_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcf6250-4ed7-4684-92ec-437017ef1567/dudog.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144476142/how_to_use_rabbit_tv_on_your_television.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/how_to_heal_mcl_injury.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/f/40097682948.pdfIn PDF document text
    • http://natofuke.pbworks.com/w/file/fetch/144554142/ikea_slattum_bed_frame_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94d6f38-92b5-4da5-b023-f28d0e24bbec/gelozadozixizapi.pdfIn PDF document text
    • http://silasofinat.pbworks.com/w/file/fetch/144659727/spider_man_ps4_free_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dea192e-1f1d-4fa4-b528-88d5306c6509/sapavugug.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144505548/how_to_calculate_selling_price_with_fixed_cost_and_variable_cost.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144655269/how_to_get_bloons_td_6_for_free_ios_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d45ca47-163d-4c32-97b6-f3bc74c4ac65/81117552644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990f6b00-bfdf-4eb5-83cc-b3087427211c/69740850951.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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 5856 bytes
SHA-256: 3fec2c3899690e8df38bef31ef5c7b62b226c789b6be334280958ea6ba6844e4
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10848 bytes
SHA-256: e952846038541547b37892883dffde284e9849b446998de228c2eb3b77af37dd

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