Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad525ca73662867…

MALICIOUS

PDF

78.2 KB Created: 2021-06-09 00:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6eced8418a980080e48df7efaf2f95dc SHA-1: 514740ca88be08780074467ede49fd1f08729754 SHA-256: 7ad525ca736628676e00554d8d96623d9174025ce00f7f86a22a81f8218d8de9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/pbw?utm_term=scott+pilgrim+comic+book+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479470/normal_6067c25ee0bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_605bf35cc172f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_606da5daa2088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_6065541bf2020.pdfIn PDF document text
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/11a746923d.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/25ee8381bea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_6056d1b6d2b63.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/e1074b4a-81f4-45ff-b37b-7a60f8489bad/setagonisuvajufipe.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144899310/sibifewujuwijamiminajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d758fc70-0aa8-4ad9-a418-2af8f230d7e9/wd_4tb_my_cloud_ex2_ultra_network_attached_storage_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76eeaa4c-0819-4251-850a-1ce02ffca854/study_guide_and_solutions_manual_for_organic_chemistry_principles_and_mechanisms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b025f8b-3409-46f0-9c65-d1ebb16ac6a5/vagiwikujibigulubatotom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672bbe97-293a-4af1-be3f-f7fdfe2a6f28/26375431127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6666d1d7-35fb-4fbb-b5f5-ade060aa6284/how_do_i_program_an_orbit_sprinkler_system.pdfIn PDF document text
    • http://favixose.pbworks.com/f/best_exercise_for_ectomorph_body_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a737b7e2-0d60-4621-b740-c4cd0faf732f/50293545250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51922d80-cad4-4243-b261-ddc491c70709/hot_spots_on_skin_in_humans_no_rash.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/f/yaad_piya_ki_aane_lagi_song_download_bestwap.blog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8927a10-4def-4763-894d-82dd83273fa4/minepebaxivolid.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/age_of_civilization_2_apk_download_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16ef9ba-6300-46ee-b6c6-dcddd10d4952/42678916396.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144595428/annadata_full_movie_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84611aff-160f-44b5-afbe-b639f8e98c9e/lojisuguzodamoki.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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5172 bytes
SHA-256: 272aadba80eff1ca728b914fe23ed13a39098839053edb1e9ff8c058775090e6
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10672 bytes
SHA-256: 6904d4363681588cc9d365c5da8fc85e03e287de3547752c9882acc1a8821a37