Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17243db843bff2c…

MALICIOUS

PDF

84.9 KB Created: 2021-04-04 08:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24eabeec46f609332171c157128d423c SHA-1: 9bad5223b22b05ceeef912ba8e6e72aade66f87d SHA-256: b17243db843bff2ce7974ea24d4d7303539bf90d65b3521dc35902a50f8f0b93
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://xajibur.ru/strik?utm_term=black+spider+xt+helicopter+tail+rotor+not+spinning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5ff868f90854f.pdfIn PDF document text
    • http://lorenbayi.com/76452517535l6jq5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_603bd6747e258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_60199e143b3d6.pdfIn PDF document text
    • http://aazzzry.space/vixiravezazipasulovesadc4e0p.pdfIn PDF document text
    • http://pizixaranifasof.iblogger.org/84452069311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5fdff83a7e8a5.pdfIn PDF document text
    • http://english-10.site/34962267895tamxi.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/08f97547-09ac-4386-9bb2-b90f9dbe2543/63008487549.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_16077a8aae184492aa566c3630bbeb2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/waliti.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/92422344066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e11df9-2db8-4d9b-86d9-d74897b9bc3e/the_vampire_diaries_season_8_episode_13_full_episode.pdfIn PDF document text
    • http://gapefixuwaxa.epizy.com/waybill_template.pdfIn PDF document text
    • http://gijafusatuvaxoj.rf.gd/35991433296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87dd42e-965f-4b87-b9d2-65022272f8bb/tugadule.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_6e5c32c446ab4ce0bc5ce56c0ecf6073.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/38569577594.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/bonudojedogixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f772267-1f60-4810-b064-8f584c0370ab/52502862836.pdfIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_ffee8b6b736b4a7fbdd47e6675524aca.pdf?index=trueIn PDF document text
    • http://sibazod.epizy.com/section_1_chemistry_of_life_worksheet_answers.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_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 5516 bytes
SHA-256: c659b54c564e54bc3839aa4915cb5f57ba4d225752c1bc4c933aa3cacdcb711e
font_01_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 11268 bytes
SHA-256: f8af3ab3674f0c85de35642220a2f9c0b20a95ea2674f69a72b1e8fe28f4bcfc

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