Malicious PDF — malware analysis report

Static analysis result for SHA-256 760071b2765b9c64…

MALICIOUS

PDF

80.1 KB Created: 2021-06-08 11:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 29a5270961edd6c0b6e595e83fe57fe1 SHA-1: ca15930462c6e7781a304e6c59c17965fa0c5ced SHA-256: 760071b2765b9c64fe158855244528282f55ff55268bfa8d8acffa7247bc526f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/pbw?utm_term=android+10+one+ui+2.0+beta+uk PDF link annotation
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/rewokirif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fef89cbbf48e.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/jubofoxup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5ff986ff190fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fdb7c603e9de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fd84de46a7bf.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/juzasu.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/30c0f91d-1fd6-4352-b700-596a6a9d730c/fender_passport_300_pro_manual.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144443013/andy_app_player_64_bit_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c5fb81-58e6-42e2-9450-9de7afe603c8/pejejo.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144592671/how_to_install_wyze_camera_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4c37f1-ee47-45a5-8394-86b166416297/xumejuputufavivab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd08f6af-2e48-4cd0-8b87-9939ea53a9da/84007986474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106dd347-0e26-49d1-90be-b7b5bfcaa7ec/25396373017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b0eda6-2c31-469f-993e-ea56c87d0abd/zone_4_pittsburgh_police.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ba695a-4cf3-4b70-b52f-c94640238d39/migob.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/w/file/fetch/144539928/google_opinion_rewards_apk_for_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b71b3df-3c3a-4a11-b3a7-f22a06eeabe2/bibutotasinoxawedetuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea00543-2031-4515-8bab-da791bc13544/harry_potter_and_the_cursed_child_scorpius_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad57eda4-2b94-401e-bd30-4607e0507c2b/plot_diagram_for_the_grinch_who_stole_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3665e6b9-b627-4a00-8dc6-61ab20f73c98/vurupovulopaxasidefoxanuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58392c6a-d01e-4cb1-ad09-da199e6084da/the_iron_king_maurice_druon_epub.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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 5044 bytes
SHA-256: 5ecb9dad94397eeb0319237689c30d40282331da9bc5e22783740469fc779a65
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 21928 bytes
SHA-256: e34b78bde1266fc2778d1907e44e2d1a4b337c3fe8e93af80f5e357d42e5bc08
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e