Malicious PDF — malware analysis report

Static analysis result for SHA-256 f267718f47d734e0…

MALICIOUS

PDF

145.7 KB Created: 2021-03-17 14:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 76659535a89f66b17ce008f4236dae67 SHA-1: 9774f6ed7b6dd55727047f4362718bedaa6f2f68 SHA-256: f267718f47d734e0cef5e49e4cbe4205ee76750d50b80176170e5b9a8ad7e113
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 as a link farm. Several heuristics indicate this behavior, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ClamAV detection and ML classifier also flag this file as malicious, likely due to its role in distributing or linking to other malicious content. The embedded URLs suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

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://lozipotod.ru/award?keyword=binocular+vision+disorder+pdf PDF link annotation
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/5914937.pdfIn PDF document text
    • http://chategratis.online/ultrasump_3_manualafwj1.pdfIn PDF document text
    • http://vodoroding.info/jadirubusovibukiledosateetl0.pdfIn PDF document text
    • http://jelonit.22web.org/10_kn_m3_to_lb_ft3.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/joresirorixep-ziwenutoso-zunokebo-momide.pdfIn PDF document text
    • https://sozefusezat.weebly.com/uploads/1/3/4/8/134860931/ziwinonaruzim.pdfIn PDF document text
    • http://vashastrahovka24.ru/zonesilutidmc8cp.pdfIn PDF document text
    • http://antonio-ita.space/bovegogimolawodeto11z7o.pdfIn PDF document text
    • http://doburepos.iblogger.org/beats_studio_pro_wireless_earbuds.pdfIn PDF document text
    • http://wownatural.fun/jixotobedeypz0o.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/9031799.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/6382278.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/8865b2b3-5d46-45e6-b986-bc4ab4c10c3d/guitar_chord_progression_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe68f401-81d7-4028-9568-56bdc4d8b9c0/busatojid.pdfIn PDF document text
    • http://kutifakibidi.rf.gd/58347039298.pdfIn PDF document text
    • http://fukorow.epizy.com/18162319227.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/muwikoxuwemokokimafid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383969a3-3dca-445e-91f1-0b6dc5289ce4/derapokokugepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d29245-ddff-4978-9cbb-d5e930d022ea/how_do_i_connect_my_uniden_cordless_phone_to_the_base.pdfIn PDF document text
    • http://jegelafaxorew.rf.gd/acrilamida_toxicidad.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fancy_font_style_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b878648d-38a6-4e7d-9c9f-f3023e8cd7c5/what_is_an_infrared_patio_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8afe036-744a-429e-b2d6-c46643b2a713/wd_tv_live_media_player_wi-fi_1080p_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/89472998661.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/the_power_to_get_wealth_john_hagee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994339c7-06b6-468c-9bf2-d346fa194ad3/who_are_the_five_primordial_deities.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/freelance_web_designer_contract_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d156f14c-70ba-4de2-905e-8e263ff7f929/how_to_take_apart_a_nook_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a357f37-6240-4bb4-b532-e2022ce8cad4/37534290929.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB74 3464 bytes
SHA-256: c94137f2c4a51d85084a5a7a4f6b8ae95371a52c08efecd4e4d2e05b61583c9c
font_01_sfnt_off0001f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7F9 5256 bytes
SHA-256: 796e66f1931d7821131ec2400b2f1d34e05c7c862b652d7ad54ff2ac040e0d35
font_02_sfnt_off000209f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209F1 14672 bytes
SHA-256: 0778df1844ee307cf51be978bef1714ee0488bd740437254517cb70724d909c6