Malicious PDF — malware analysis report

Static analysis result for SHA-256 52397c58f9e22975…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 08:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7cf2939f4c19ad933927fdac9c4b1a1b SHA-1: 48a71f1b2c6c13f318ad3047efb759cb0c71369f SHA-256: 52397c58f9e2297512a4709851997f5c246d8f17f41fedecfcc1930493251ca5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though truncated and partially garbled, contains text suggesting it is a 'Communist manifesto book summary' and includes metadata from wkhtmltopdf, a tool often used to generate PDFs from web content. The presence of an external URI pointing to 'golowaki.ru' with a UTM term suggests a phishing or redirection attempt. No scripts were extracted, but the overall structure and external URL point towards a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=communist+manifesto+book+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372972/normal_60469cebb5468.pdfIn PDF document text
    • http://get3creditscores.info/juvikudinomugev4bmdi.pdfIn PDF document text
    • http://medyahanem.com/ladomapalujipubokejabal45wz5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_604d2c5ca43e3.pdfIn PDF document text
    • http://save50it.info/asus_xonar_d2_pm_7.1rn2g9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_603fbcb04b2b9.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/navubuxekusi.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/periodic_table_hd_pic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_6056b5729bf2b.pdfIn PDF document text
    • http://teachersaid.fun/mofipugozevuwobebodoti8t9zy.pdfIn PDF document text
    • http://memisada.mygamesonline.org/kaxulu.pdfIn PDF document text
    • http://zuwazekanusur.mypressonline.com/korean_learning_books_free_download.pdfIn PDF document text
    • http://kupiokno.su/harry_potter_storyteller_ornaments_2020hdqjr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375716/normal_5fdf2b1080fb0.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/sinopiduxevenitijubunasel.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/51ab2522-b63a-4201-af08-c169cfab0552/dutch_grammar_checker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6945fc09-8b1f-412e-a202-c0949dd6d64b/pemeniritisorenoviwibiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae198ae-fab8-4aae-814b-9a7d5678ace0/estudiar_inteligencia_emocional_a_distancia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6272b7e-2ca1-472c-96fa-89e4800e561a/pizowedunanisuxigomekefi.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/jipitupazefipinovu.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/dalegotunibuzujolupijalav.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/bts_guidelines_unilateral_pleural_effusion_adults.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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 5092 bytes
SHA-256: de97acf4ee07ecc1037d0b45e8edaf24e0bb733cd70f8a3f4da2515967ddbe48
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 11200 bytes
SHA-256: 3c78618c4502732f71917dc28e9d4b3ff4e32a749c28f6e7bac9090fff4c892b

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