Malicious PDF — malware analysis report

Static analysis result for SHA-256 3782a7a2ec16ba94…

MALICIOUS

PDF

75.6 KB Created: 2021-03-07 19:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6efe9c9d1ce68473db11ac93b2cfca79 SHA-1: 7fb98130c84a84c12fa637d1dc2f5139f1c84b96 SHA-256: 3782a7a2ec16ba94e586a87b8daaf54b46c92556ae8f2b0319eedfa8eb7c7ee2
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links to potentially malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the nature of the heuristics and the presence of many unknown URLs point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=counting+cubes+worksheets+grade+3 PDF link annotation
    • https://cdn.sqhk.co/wobuwaseja/jeOajdU/earnings_per_share_calculator_template.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/how_to_reset_microsoft_edge_password.pdfIn PDF document text
    • http://danixoxixofizi.iblogger.org/seascape_with_sharks_and_dancer_monologue.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/Fjchdjh/tuberculosis_test_side_effects.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/jd7Dshg/vodifofujuribote.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/dXgfXif/zepusosefuvizefatikitilib.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/agfXQja/nefiraregus.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/xukufutafosuni.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ghihgia/nuwixeta.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/izjejf0/steam_new_chat_room_effects.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/ih4sjd9/buwamorolavudarutem.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/a4l2Drn/palojuxapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/pikenuzaloduvadamok.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/30033188033.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/onyx_guitar_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/romatisazezopeju.pdfIn PDF document text
    • http://magotabitujotu.rf.gd/sharp_lc-43lb371u_legs.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/aankhen_video_song_full_hd.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/vililulefegazib.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/block_phone_number_prefix_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73af23ee-cd6a-4f1e-bd03-d2e221ca922c/gabriels_inferno_3_passionflix_release_date.pdfIn PDF document text
    • http://kezupomevul.rf.gd/27153823418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87858a59-819a-483b-90b7-457de20c6804/nomubatebibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1053f6f0-e2d0-4ab8-abf8-4819edbde2fe/why_is_my_pressure_washer_pulsating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b894b804-7f0f-4924-8966-71d9b1caf7a1/how_to_answer_table_topics_questions.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5536 bytes
SHA-256: 846dee131bcafd37ead1c6ababc0e93d6261fc7fcd1c72b250d1e04d61606e6b
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10188 bytes
SHA-256: 463966cc6e8194eac4a61cc98cff9b55f20415c2f45e6c35fa3250f680ddcc86