Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c21c71f94ae61f…

MALICIOUS

PDF

86.2 KB Created: 2021-03-20 11:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4b51d598c33b84306e6c320b34997906 SHA-1: 31b2145c8831cf065bf96b11df11c680b463d3b6 SHA-256: e7c21c71f94ae61f500be190c1ffcafab7d97bb46cb1a7fe56557b3fcebde65e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/wix?keyword=does+human+urine+keep+coyotes+away PDF link annotation
    • https://domekemukud.weebly.com/uploads/1/3/5/3/135327345/6149093.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/bijkrje/puzzle_parkour_maps_fortnite_codes.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/296459.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/vaninu.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/igi6ibQ/free_stuff_apps_for_ios.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/morir_fuvodezon_lalobatotafolit.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/rajusumijokanupi.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/tizumiwuve-jaropu-sopojaxedodu-zotobino.pdfIn PDF document text
    • https://jebigifapiw.weebly.com/uploads/1/3/1/3/131379276/3741345.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/viremanur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_604e765f2524a.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/kuxefifarapujujasav.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/namobovuwurofev-govuremusox-bepadexuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_6025ed1f17917.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://uploads.strikinglycdn.com/files/5a72176d-7de7-4951-a1c4-98c5858f023f/proform_exercise_bike_seat_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4536535-f146-48fc-80cf-2dd52d56fead/how_to_change_picture_from_opening_in_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3604fea9-3ece-41b4-83b1-f85e5777233f/jisifuxalilejoranajapemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4399c7c-a559-44dc-ab62-626d6fd520af/how_to_win_roulette_every_time_gta_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e628538-fd0a-4d76-b033-31b1b214cc92/62971702537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1668c96b-ef17-4e77-a73f-9af36cd671e1/evinrude_25_hp_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8186ec74-6030-4c11-84f3-9e08ae160e4c/how_to_join_the_royal_army_medical_corps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8986cced-e476-4946-b4d2-ac1d12b17c80/42822690754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c84819-9ce9-417e-8cb7-98aac4b3295f/89308414307.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_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 5280 bytes
SHA-256: 3a3a7e08e82f37f207a3c3e6fa436b8c89b01380400d7a3a877c331923c61686
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 11668 bytes
SHA-256: ca0b3db01e30edf919f9fba1e899835444825936e120b153c5f01513a260d3eb
font_02_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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