Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced83e8f125b0ebf…

MALICIOUS

PDF

116.9 KB Created: 2021-03-28 21:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ed7af72fbeed38e10455f4025ca5da2a SHA-1: 54661bb851090bcf5133954c64eb180352bfcce6 SHA-256: ced83e8f125b0ebfccd059e8dc38d6275100223bae32666b74ebb9907a7145d8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect the user to malicious content, potentially leveraging embedded JavaScript or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/award?keyword=acid+rain+and+its+harmful+effects+pdf PDF link annotation
    • https://cdn.sqhk.co/sebetite/5Ohjjfe/cute_animals_colouring_pages_to_print.pdfIn PDF document text
    • http://womovenum.sportsontheweb.net/old_ncert_book_of_biology_class_11.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/disuwibamovelowub.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/71280682731.pdfIn PDF document text
    • http://itsnat.space/877629873284npn5.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ihjfzhd/17507933102.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/hiajcvb/98548726934.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/c25465.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/gddijhg/best_pickup_truck_2019_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/ijVijif/newikibatukujupogubadej.pdfIn PDF document text
    • http://reduslimer.website/zawinulewijorej2wtxx.pdfIn PDF document text
    • http://xixubitawub.iblogger.org/check_if_json_object_contains_key_android.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/maharashtra_voter_list_aurangabad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taterawi.rf.gd/tutepudap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fb989a-bdba-4988-bf00-ee4f4b132d9a/17773502313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173a0c6c-760b-417c-ace7-c80f7dcc456e/robujemuw.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/apartheid_in_south_africa_worksheet.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/adblock_plus_full_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad5b7e5-bccf-4fc0-a71a-f42fb6598d04/similar_polygons_geometry_worksheet_answers.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/46747593440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d10bce-2089-406a-a1d0-735864316e9d/fexekew.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17418 5384 bytes
SHA-256: daaf87ba86335391746893812149b969d83d2bfe7e4194c1c29ff2cd852ec3e4
font_01_sfnt_off00018640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18640 12648 bytes
SHA-256: 002b026c4af8c67c26442be338ba5d4f425be02838e228511c0041bc0b55997e
font_02_sfnt_off0001b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B016 16100 bytes
SHA-256: 9e9cd3e823d2b2c43597f4611ab9b63d40ea3e1a9eeb22e83fdae90966f5e152