Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcfe91da25f2212…

MALICIOUS

PDF

81.6 KB Created: 2021-03-08 10:38:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bd07848d32604adcbe16ffcdf3391034 SHA-1: 25f0a15b827ef54e61980c49137e1395c44e4949 SHA-256: dfcfe91da25f2212f6b622d32214879b426fbe260d54247fdf79489112199cdc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to disposable domains or use URL shorteners, suggesting a malicious intent to manipulate search engine results or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=human+scavenger+hunt+icebreaker+pdf PDF link annotation
    • http://ravujonawugip.22web.org/how_to_replace_samsung_tab_3_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/EAdbggF/gosuj.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/ijdsjfa/h_and_m_coupons_in_store.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/hetjc25/megalodon_storm_rc_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6019d678c8424.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/bicheNF/fox_deportes_xfinity_channel_number.pdfIn PDF document text
    • http://lufusozajufa.22web.org/pawudesujosozezozodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5fc78efe659c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_603049e5604ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408707/normal_5fdd692aa1714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_604376afb399a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fatikonavori/alteryx_server_2019._1.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_4a58e12511174295824a7f394f9b2c57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb4f46f-035e-4963-9a1e-1283e9751537/how_to_measure_hoop_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8ae209-da7d-4d03-9a4a-563ddd30ef26/easy_how_to_draw_anime_body.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/numogamerokafaxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114bd102-4851-4461-aaef-17f32af83982/wivibowofobivuvuraxisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f060d1-c5c4-40db-9974-6f347e7af3f6/axis_football_2018_game.pdfIn PDF document text
    • http://josuzedalad.epizy.com/list_of_irregular_imperfect_verbs_in_spanish.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_46c602880b744fd781a834504f3691cf.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5532 bytes
SHA-256: 0a96de62095543ea3c25bd40aa9127dab96a0520233b1b37130a5f2f6afc9c61
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 10228 bytes
SHA-256: 0e500d0c7bc2276ca9b5d65504324d67bd6f8297bace43b9b75d0c41508e214e
font_02_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34