Malicious PDF — malware analysis report

Static analysis result for SHA-256 166f8cfc54fd90e8…

MALICIOUS

PDF

88.2 KB Created: 2021-03-24 21:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 068345c489acb419064c322128625c37 SHA-1: 1e6583e8d9b0219a836b06365c74c5ae95b28b5f SHA-256: 166f8cfc54fd90e8dfd70902076262d4896772e0b1d7a214cd4b6be4194fd171
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 hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://resalured.ru/award?keyword=baf%25C3%25B6g+antrag+formblatt+3+pdf PDF link annotation
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/goraf.pdfIn PDF document text
    • http://detonic-de.website/90144683173wkahf.pdfIn PDF document text
    • http://delalikifavaru.iblogger.org/kotuposeluzerazuzu.pdfIn PDF document text
    • https://lamivorimu.weebly.com/uploads/1/3/5/3/135330715/suvukefow.pdfIn PDF document text
    • https://lurufimuzid.weebly.com/uploads/1/3/4/0/134042860/7549156.pdfIn PDF document text
    • https://mawakizuk.weebly.com/uploads/1/3/0/7/130775730/cdf4f34ad82.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/7740176.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/iso_9001_internal_auditor_training_materialpdfkgw1e.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/khg24hi/ropozokurejejebafazin.pdfIn PDF document text
    • http://gopikapi.22web.org/8557312273.pdfIn PDF document text
    • http://radanukodufam.22web.org/android_studio_define_apk_name.pdfIn PDF document text
    • http://uaportal.site/noticias_telemundo_52_los_angeles_videoswhnh6.pdfIn PDF document text
    • http://promooffer.site/how_to_get_free_money_on_gta_5_online_solor9gpr.pdfIn PDF document text
    • https://cdn.sqhk.co/jonosefo/eJ8Lihh/fefedabarubodimasowimox.pdfIn PDF document text
    • https://fupixadig.weebly.com/uploads/1/3/4/0/134096542/994900.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/gfayhix/zimep.pdfIn PDF document text
    • https://kovakaxidaxid.weebly.com/uploads/1/3/5/3/135322813/61b462660b.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/aafifgg/fetoxobed.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/0Qnjbkq/48039940412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_fe889b9098274352888fd837a28accb2.pdf?index=trueIn PDF document text
    • http://dogosiroluv.rf.gd/automatic_door_bell_with_object_detection.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_19b43ba917a041eeae6dd5862fed6f14.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_9075a2883ba247c69d4605accd11f4d5.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_a8fbf91eb1944a3ab6b6dc282bf90615.pdf?index=trueIn PDF document text
    • http://lejafekisu.epizy.com/how_to_write_a_check_for_chase.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 5672 bytes
SHA-256: d8f3662d51f16866a36252262abd5017da724f7a0939bc73de775231c45cec4f
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 11672 bytes
SHA-256: 96d44a0b7c31c205c0f62b84cc952b20344793bba22cb925d519a6bf6e85922c
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 16772 bytes
SHA-256: bd97a206ef7768b0bffbddcaa47745e88224d15b472df7c477ab72123408b7a1

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