Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6fa32db0be9722…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 16:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 83e7ee8d3d37247f71524f36b7a88c2d SHA-1: 5976786494db9522737a03f036bca844484d748f SHA-256: fc6fa32db0be97223230803b1d0fe23078c38a9a12cbf4165eba303e1b66deb1
134 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious content, with one URL specifically targeting 'how to repair hp laptop broken hinge' as a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/strik?utm_term=how+to+repair+hp+laptop+broken+hinge PDF link annotation
    • http://besuxiju.22web.org/12th_biology_important_questions_2020.pdfIn PDF document text
    • http://noxogejukebe.mypressonline.com/visominidegil.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/garmin_gtn_650.pdfIn PDF document text
    • http://arfeshome.com/preface_to_lyrical_ballads_1802g1vfa.pdfIn PDF document text
    • http://jetaxopavajuluw.22web.org/27333718510.pdfIn PDF document text
    • http://drawer.icu/86109391234q08g2.pdfIn PDF document text
    • http://xumugawejal.scienceontheweb.net/fikotekunozaja.pdfIn PDF document text
    • http://spencermcman.us/lezemisumejopujujunj0q6d.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/ridogozat.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/68912974515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nevabaza.atwebpages.com/zakom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6055c1e9-d088-461c-a67f-652f46957242/taxixavemipakutabul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78553b2-9de1-4994-abb3-71b77ebefb86/yaskawa_v1000_hbb_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181afc35-ed9a-4dde-908f-e920a5f0bc5c/zuvituxuragigulobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffaefa2-2ba1-4755-9abd-65dad27b3012/gevugigafikataf.pdfIn PDF document text
    • http://dakiwadizadenig.rf.gd/rangers_apprentice_book_13_free.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/tratamiento_para_la_anorexia_y_bulimia.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/24403050661.pdfIn PDF document text
    • http://laropijodozu.epizy.com/badagidodetemolekadepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dccaa97-51ef-4c9a-b472-e3b900c07f89/54909604369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f56df22-2a7a-48c9-b4ec-89ee36c72e32/ziduzel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 4948 bytes
SHA-256: bfbaf8a3573f24be150a8bf40f2068d762eae013e114ccbf806efdc46a1da6e9
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 10352 bytes
SHA-256: adc205e7f938b2ceb14850c1403ae3afe66d71defc6395a14231f10cc5677111
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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