Malicious PDF — malware analysis report

Static analysis result for SHA-256 7039ec5b5af713c5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-01 01:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 63fe499ccf15b03c707a83ccbe158dbb SHA-1: 200d3861969a29de2347dc22757a7126f3dd4c62 SHA-256: 7039ec5b5af713c5d8a47d2570c06e7258b43a95daaac238244fb51e8747a3ff
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 0.9956

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://jumiwimov.ru/123?utm_term=aminoglycoside+dosing+guidelines PDF link annotation
    • https://zivuxava.weebly.com/uploads/1/3/5/9/135991205/tuzulonijo-vaberovumozizuv-gilofuvibo.pdfIn PDF document text
    • https://lofugaliwowutuw.weebly.com/uploads/1/3/5/2/135299309/gapifizebub-pisovarog-levijamubofib-tegubajuxudoz.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/dugudarirawe-gunaduminon-dezebola-samana.pdfIn PDF document text
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/leroriko_wofesominumupo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fee68909e10f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376869/normal_5fee0a61a4eaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_600111565e99b.pdfIn PDF document text
    • https://panezoso.weebly.com/uploads/1/3/4/6/134697542/dogunimi.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/sitemakizakip.pdfIn PDF document text
    • https://firuruxuzero.weebly.com/uploads/1/3/7/5/137502241/nitos_ketazikavawuwov_vowunozepobi_xegudore.pdfIn PDF document text
    • https://rupilobeva.weebly.com/uploads/1/3/0/7/130775598/5932919.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/mejimifibabifuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_602a51bc56785.pdfIn PDF document text
    • https://nutumavu.weebly.com/uploads/1/3/5/4/135400781/4f842ba905991.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/13f9f2b9-7707-4f60-93bd-502808751956/silky_johnson_quotes_i_hate_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea88b6b-5a83-40ba-9554-2c4956963dc3/how_to_calculate_average_velocity_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a47b7d-6ade-445f-92c7-3a86ea9fac76/schaums_outline_of_discrete_mathematics_revised_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6832414d-4120-4dda-b69b-fafa4a5bdc13/6537954863.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/las_colinas_course_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1743ec9-f160-4280-8734-fc65acc960e4/27896040815.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412299/75533067768.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144417657/biduf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9b701b-f4a5-4333-a75c-abdd1474d62b/gixini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87654006-a531-446e-9dc0-050c7a9338ca/zemefiluxejif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f57f9b6-55e6-41c3-a996-947fd543a9a3/visakegarekipofe.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144428901/faceniff_product_key_free_download.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144419820/majusiregutifetipu.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 5044 bytes
SHA-256: 86a192e2e317707faf83ec8fb4846873f80ba0f4758eefe45759c3a0bc042607
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10564 bytes
SHA-256: 6ebe4ec7471f67e0dca9c9fb33306eae61f53205a836fae41786c67a42865a79