Malicious PDF — malware analysis report

Static analysis result for SHA-256 8812cc502bf24fad…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 18:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0256ec1dc31c5ccb4f71ce64acd1f686 SHA-1: 1c0c5c1a4f835385b4cb5b02d310ce7d3eb781af SHA-256: 8812cc502bf24fadcdcad8d52a0062eb97ed52937cdfda5933a3a7916abc1102
186 Risk Score

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. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm designed to distribute further malicious content or phish users. The primary malicious URL identified is fokemale.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/award?keyword=academic+english+vocabulary+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6037b874033d3.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/jjvYX3n/vlinder_boy_dress_up_games_character_avatars.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_604e18eb6cfd2.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/ejcRxih/guide_signs_are_generally.pdfIn PDF document text
    • http://tamazilewuviden.22web.org/nibexotapajewon.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/jB0ihgg/kevezoxujofu.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hhUgiRu/99478465918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novezepif.rf.gd/fuparu.pdfIn PDF document text
    • http://jigikox.rf.gd/alone_boy_wallpaper.pdfIn PDF document text
    • http://petefuzaz.epizy.com/10063582804.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_ddc3e1a944c740aea5c9ee9ad668489f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64565df8-5068-47df-a465-fbe3ab9d340f/zapavexopudirisub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bf07fc-358b-43e5-8e5e-0d04ec3e1fe3/look_whos_back_netflix_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885584cb-8f59-47ec-a443-5ced3de9658d/inteligencias_multiples_y_cuales_son.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69e19cc-9b85-4ddd-ad1a-60bf9195ed35/optical_fiber_communication_p_chakrabarti_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba71fef-1e47-4138-b42d-d871868008d1/dd_5e_character_sheet_creator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110409e3-1415-4e4f-a28b-bb0d7e67e186/why_is_the_standby_light_on_my_tv_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3339ff3-36a3-45ac-b673-5faee06c51c3/wararot.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_c64c624a632542cebc17d3db0db03d32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f834b787-7736-414b-a0ce-a354f4b3439e/jvc_kd-r860bt_wiring_harness_diagram.pdfIn PDF document text
    • http://sixanuramusasit.epizy.com/24996819510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63771dc-2263-4600-a348-58fa6c9d79a2/76665290253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f990be3-1897-481b-85ec-25ba39e096a0/what_is_the_best_washer_dryer_combo_in_australia.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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 5924 bytes
SHA-256: e3f4c91b8b79f54fe45e4e9e882cda8baf818d27eec68b7ffc6bc871ec00b95a
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 21280 bytes
SHA-256: 9d1ecc0d55dc75f7e8bdda1cee24f0ae2e5d74a728086ff50f12ab84e061308f