Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afb6bfdffad2d19…

MALICIOUS

PDF

71.6 KB Created: 2021-06-04 19:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d3001a34fcd1a66f6ca91edb467436ab SHA-1: 44422da344e52e315f1f33e1d2873c11969d8c39 SHA-256: 5afb6bfdffad2d1949afd9718c41bb292d9dd8c8f7539fb6332d0d0e93135657
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially harmful content.

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://queure.ru/pbw?utm_term=how+to+pair+a+remote+control PDF link annotation
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/4565431.pdfIn PDF document text
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/wonumipa-suzakemopese.pdfIn PDF document text
    • https://juroluse.weebly.com/uploads/1/3/1/0/131071309/7497074.pdfIn PDF document text
    • https://gipalefujujal.weebly.com/uploads/1/3/1/3/131379678/1578889.pdfIn PDF document text
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/pozusemixug.pdfIn PDF document text
    • https://tigidebo.weebly.com/uploads/1/3/4/7/134740117/tibol_webabom_jifotulemave_tezeserobupidu.pdfIn PDF document text
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/pedisedimisu-xoguzoxafi.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/5604453.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/0c7a1b.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/88d0beaf-b5fa-403b-a2b5-b3346daeaec0/led_replacement_bulbs_malibu_outdoor_lights.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144529671/empower_b1_intermediate_students_book.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/nolozud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06f7b42-d8bb-4d6a-bc59-e7ed9f3b19a3/english_course_classes_near_me.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144511923/kufanevag.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/manual_de_interpretacion_test_casa-arbol-persona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a6af20-1c37-43d6-a5ba-114fbe02528d/migefekefuzak.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144556113/nerovikedoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578adce6-9767-4f92-bd53-fc4659a2a28f/pewizurawowumodavonoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41160e39-0044-428d-afdf-24e9b866814a/what_is_the_coldest_city_in_the_world.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426765/world_coin_price_guide.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144420654/lebukixarederewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8a75f2-89fa-4a97-8783-12b71e3ad8cd/62043150115.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/bad_piggies_free_download_for_pc_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebd40bf-3259-458f-b1f8-c664cf2f6db6/download_hyper_run_3d_apk_android.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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 4952 bytes
SHA-256: a8b8022adfd4e865ae84deb8ab32c92fd119c42f2e6058ab7d269b3e0a54d503
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 9824 bytes
SHA-256: b406f069605f0be0cd975d2bd6cc19c81cc6d35def42b40db5d9908262509d94