Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb4729103bd87fb…

MALICIOUS

PDF

74.2 KB Created: 2021-03-05 03:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1345a8b109621e5b185703871785ec12 SHA-1: 9e9df2bfca2baaca48917409a6a7d3ec3032d9f9 SHA-256: 6fb4729103bd87fbd7efd8001dc4bafc42b132d1d64501ff2dff82432fb79ea9
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 0.9996

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://druttle.ru/123?utm_term=scag+mower+parts+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6009d2a805a32.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/aaoo5ZG/halloween_movies_in_order_they_came_out.pdfIn PDF document text
    • https://xorigikaku.weebly.com/uploads/1/3/1/1/131164164/b8e715.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ijjiJia/gorevulusigibifejelevofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_60370b77182e4.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/riwege_zulom_ninekarilalowu_ralisafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5fe90f0852f24.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/vgfGt6W/a_countervailing_theory.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/9ad07.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/jchbidL/physics_class_9_motion_important_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_602cfceb158c7.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/GhhZULE/78080072554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5ffde152c3bc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/actin_protein_occurs_in_two_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81f4a94-0e00-43e5-8a64-e1198147356b/70105203992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46ed1fa-9a25-40e0-96a3-136408b2f1e6/properties_of_exponents_examples_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be47bb61-c122-420f-98f1-488531b8ba55/lista_de_verbos_regulares_e_irregulares_en_espaol_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06131506-d87d-408c-b747-e04ea438f712/vikemefilorivupipavuloxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a9a910-0711-49d1-9c6a-b2c8972db034/zixalibizuwetej.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/why_students_should_not_wear_school_uniforms_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/creative_cv_word_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6b8c7e-553c-4189-a109-7acfbaa09cf8/bomipovenipaxuzirevas.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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 5416 bytes
SHA-256: efda5b4e842074433b36dd10f17307dd6884b469d1c6aff9d9ef89376c38051d
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10756 bytes
SHA-256: 8e2eebb8b9e91dd0624b8bbe24082ae691537c25c2eee650e25421e7c1acc901