Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ab1138645bf16d…

MALICIOUS

PDF

134.4 KB Created: 2021-04-07 06:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e21095304bc58012fe36a7b1f429d60e SHA-1: 5fc6ac199705d5ae1922a77eececf3d82ff5283d SHA-256: 05ab1138645bf16da5b19b9b509590a9277db6197417440e905d25fd5f2d7c3d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious content. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/award?keyword=business+strategy+examples+pdf PDF link annotation
    • http://sehq.xyz/xoviwosalusizanovokafa2qnif.pdfIn PDF document text
    • http://20970907.net/lodger_notice_to_quit_template_freefvtdi.pdfIn PDF document text
    • http://pedron.fun/marathon_running_tips_for_first_timersuogn7.pdfIn PDF document text
    • http://sallely.xyz/fipifijasikifulivuk1zk75.pdfIn PDF document text
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/299920.pdfIn PDF document text
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/7773927.pdfIn PDF document text
    • http://meetchat.space/wa_gi_covingtont6nma.pdfIn PDF document text
    • http://theharaka.online/10_phrasal_verbs_with_meanings_and_sentences92uok.pdfIn PDF document text
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/9771b8b710e9b6.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/96751f55-a00b-4db0-912e-462ba28ffa12/samsung_tv_with_hdmi_arc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a2e52e-c98f-41a3-bc34-4042e20d64fd/vibinedisebugukibetewuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0685d380-83bb-4a9c-a9dc-2d8b72433d6f/82679188130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789653a1-7f06-44ed-b313-86f229963f04/garmin_forerunner_620_bluetooth_pairing_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/36002799701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6028f316-b8b7-428a-9253-89a683f45e70/how_to_program_ge_universal_remote_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/76667273808.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/ansio_teixeira_educao_no__privilgio.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/wijidexeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70559c9-50bf-4e54-8952-6f49abc71f58/nutone_intercom_doorbell_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/what_are_written_communication_skills_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb4c12d-4499-4fa3-9cb8-917eb60bca42/shakespeare_hamlet_sonnet.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_off0001d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D098 5580 bytes
SHA-256: a3443c1ec683bd6706ef3e33b56814d594c6628d31de11d683abe47f689b9ab3
font_01_sfnt_off0001e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E391 11776 bytes
SHA-256: 2e663565c5fed79b74dbec751926153d07acda2497a56e64278c46f996aedb56