Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea369a3bb74f021f…

MALICIOUS

PDF

74.1 KB Created: 2021-06-10 00:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a9f649cde7e0504332e36d8ba9faeb2f SHA-1: 5622f04b11e5c646b1819dd169cc80224785d80a SHA-256: ea369a3bb74f021f346bc45d40a71007bd869bf0735b7de1939e3bdcfad088a7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the external URLs, 'https://irlanc.ru/pbw?utm_term=huswifery+poem+meaning', is particularly suspicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/pbw?utm_term=huswifery+poem+meaning PDF link annotation
    • https://pimelitapata.weebly.com/uploads/1/3/1/4/131454500/7653606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491164/normal_5ff796f73ceef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_60bf12c54a88e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488349/normal_606b97cf17201.pdfIn PDF document text
    • https://tukukanabov.weebly.com/uploads/1/3/4/4/134444705/riwalawugubabawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5ff615a07182a.pdfIn PDF document text
    • https://didegesutozixu.weebly.com/uploads/1/3/2/6/132695701/1454284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5ffc38e482b1d.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/738c317e-5f1c-47f7-8cf8-5789118aa83e/65529201336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845bba74-4d9e-4d65-ab42-04c28d4c1a40/xedufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcaa72b-ce4a-40c7-99ba-69bf6052d3fe/27287157506.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144476421/sisatatituritenogesaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a59e0f4-e85f-462c-a4b4-66e8233a0076/99866562559.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/lean_in_for_graduates_sheryl_sandberg.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/fixobuxed.pdfIn PDF document text
    • http://fuzugimife.pbworks.com/f/chapter_8_chapter_assessment_covalent_bonding_answers.pdfIn PDF document text
    • http://farejutotej.pbworks.com/f/sidorigasu.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/seemingly_irrelevant_decisions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32921c3-7e05-43a3-bd31-362570039f44/how_to_program_car_with_liftmaster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bf03bb-83ed-4041-a737-637de41540d4/how_to_calculate_gratuity_scheme.pdfIn PDF document text
    • http://gedelageke.pbworks.com/w/file/fetch/144890718/jaxoterovajefasonagak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a1e5be-9208-4ac2-874d-c0c43de2f83f/tevubazefimisaxumaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddec1b1f-84ad-46f3-b21b-7338d2ad0568/cant_stop_wont_stop_nyx_brow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ec54df-89a2-4499-85db-40c8bac858d4/youtube_la_novia_de_estambul_capitulo_251_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffa4f05-09f8-4ccc-a11b-d63e137b79d3/rijelaselovupolujunapap.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 5344 bytes
SHA-256: ba9294ad5d9ace494286d226a2a6347a830aeb6aa473a17e8a22f8902633dba5
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10772 bytes
SHA-256: 03faba616f74a5f6fdc61d5cf85e4562bf107aec1ac03257d001b997911f1ae8

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