Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d2d9aa938e2064…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 16:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4787e34060f1a386b1391c3988d0cd6d SHA-1: 04c7c19053c23afa6316ec285223ad73a21a8e61 SHA-256: a2d2d9aa938e20648bdab735e09d6e1a37bc0f7a7ad68883818444eb602462ab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, 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. The embedded URLs and the nature of the heuristics point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://laborke.ru/pbw?utm_term=best+th9+loot+base PDF link annotation
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/6147007.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/3b5012f.pdfIn PDF document text
    • https://wivexisi.weebly.com/uploads/1/3/1/0/131070498/sukazif-zajojokixuwige-misogo-giduxedoj.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/vipaxogamoxat_susugelapim_davipedenif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_60be09925a6e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366964/normal_5fdf9ac8466b6.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/6678928.pdfIn PDF document text
    • https://lizimiligamib.weebly.com/uploads/1/3/4/5/134584059/6995781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_60469c7d952c6.pdfIn PDF document text
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/dafopep.pdfIn PDF document text
    • https://wububored.weebly.com/uploads/1/3/4/0/134042895/4807875a4d49.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/878ef9a4-7107-4d38-bde4-60d4e0638cd0/hematopoiesis_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c636c5a8-3752-4f6c-8199-2e3339495eab/berliner_platz_1_neu_deutsch_im_alltag_intensivtrainer.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/a_christmas_memory_vocabulary_practice_answer_key.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144496527/94280927299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12b4175-2d2b-41a1-8eea-785d6cb75adb/craftsman_electric_trimmer_line_replacement_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe916cec-b7b2-4485-bb6b-55e8600156cf/duvijoxoderurerev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2f7073-f1e2-447c-8713-c6f95a1d0931/acido_cloridrico_struttura_di_lewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107bfb83-2eb2-431c-aa0b-2be60965d31a/alita_battle_angel_telugu_hd_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab35db3-78c7-405f-a031-16376b90e8a2/what_is_another_word_for_sensory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e8a7aa-5c5e-4547-97ec-d1ecc62fd2c8/tesokaga.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144648012/rhyme_scheme_exercises.pdfIn PDF document text
    • http://deduxofevit.pbworks.com/f/photosynthesis_and_cellular_respiration_comparison_amoeba_sisters_video_recap.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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 5024 bytes
SHA-256: 4bcb06389c8c8e0b5a689a9801f3304067a88cf37deea85ef6e25674f195cb27
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10808 bytes
SHA-256: e6a0c45157373a362cc87acc21df939f1880fcf258e43e3dc8a381484eebc4e7

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