Malicious PDF — malware analysis report

Static analysis result for SHA-256 7729ef982824dc09…

MALICIOUS

PDF

81.9 KB Created: 2021-04-07 14:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a475b6ce070d88ebc6cc4bcbb2c2855f SHA-1: 11425feff9c3e1976d7b1553b04440ed57356c99 SHA-256: 7729ef982824dc09a0e440ed8c44f7cd21caeea180ef6aff8a742d8e3cf10653
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://instapodarok365.site/76160206901d056b.pdf In PDF document text
    • http://xelirap.22web.org/aerobic_and_anaerobic_respiration_notes.pdfIn PDF document text
    • http://esparks.ru/feximuj4jp5w.pdfIn PDF document text
    • http://futejupo.iblogger.org/dewutarukarigap.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/jenenaxesuperorixuyllr7.pdfIn PDF document text
    • http://stikc.xyz/101_ready_to_use_excel_macrosoc3pk.pdfIn PDF document text
    • http://liwokat.iblogger.org/curso_de_violo_completo.pdfIn PDF document text
    • http://remontlegko.info/jagexavijebamuzijucnyw6.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=walmart%20black%20friday%20ps5%20in%20storePDF link annotation
    • https://uploads.strikinglycdn.com/files/6ec352fe-853c-4d67-aee7-b672dc27939d/78762592193.pdfIn PDF document text
    • http://nibejodawugizex.rf.gd/47764137307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8dad1d-1b9d-476f-bb92-fe7298412add/ms_access_visual_basic_for_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ca256e-42dc-46e3-89c4-c99726ba5c64/ncaa_division_2_football_conference_standings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd49b35-89ed-40fc-b633-5d1e9b72f034/suvitekilakajararerozum.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_0907115557624ae8af1b775b9b262b40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/monopoly_rules_auction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391985f8-5d9d-4fc0-b0e8-99ae0254c935/namagubozaxip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d68546-f25e-4540-ad85-22dfca4953ed/computer_architecture_and_organization_mcq_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41618c2b-0a77-4bc7-b49f-011e89cfae0d/how_to_use_canon_as_webcam_for_zoom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7450c2d8-e63a-4fcf-96cc-17acc9846944/casio_rangeman_manual.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_4984cd358fdb4e42b4def5f05449720b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/61327501983.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_eeae295f86cc4958b4ca803f29be53cd.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_e19387949f094df6ab740f15cdf47e22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d1a67f-fd66-4372-813a-62e976766551/gezotevifapi.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/gatakazirobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eab55f2-dfb1-4e9b-b785-e0020f52fcf2/fokegi.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_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 5532 bytes
SHA-256: 124cccd3d331827e08e4ee3eb956d11d5a3358ebad8a102139a8a084f143d087
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 11296 bytes
SHA-256: ddf0280e0a1cc4727829d7f65c41e4a0a38ebc857be3eaba96e5e88863206a43
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3