Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb51c5f91f028224…

MALICIOUS

PDF

89.4 KB Created: 2021-03-24 05:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b355184405f6978d9eed808606c69ec SHA-1: b5ffdb58f2fc85b38d55254d5c529de5e00accc2 SHA-256: bb51c5f91f0282240ceea256401efc7255e22416203699e54ef3659c630e899e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an intent to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=how+to+write+a+procedural+text+youtube PDF link annotation
    • http://avto-trokot.xyz/consumo_de_alcohol_en_adolescentes_peru6cf2v.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/0Uhf5hd/toxozadidozibujufunejaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_605124df0fd1a.pdfIn PDF document text
    • https://cdn.sqhk.co/dosovejozeb/jbNihig/30693607400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_6023ba7b463d4.pdfIn PDF document text
    • http://fortuneo.biz/data_structures_using_c_balaguruswamy_free_download9j4c6.pdfIn PDF document text
    • https://cdn.sqhk.co/wesusogewu/oMgfBFY/mawakupumabiz.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/sazobuxuxek.pdfIn PDF document text
    • http://visovewefa.iblogger.org/30770694058.pdfIn PDF document text
    • http://repaircreditscore.info/61928011315ewvjp.pdfIn PDF document text
    • http://freehookup.xyz/lilidisozunudifada5z5z9.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/ighehgA/xejuzigexokepesetedaf.pdfIn PDF document text
    • http://dmgameplan.com/anbe_peranbe_song_wapwon_liveau8nk.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/dns_323_firmware_1.09_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/DrgdjbL/guess_the_disney_song_2020.pdfIn PDF document text
    • http://jitokinut.iblogger.org/tatalaksana_jantung_koroner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_600430c0e0831.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/lenovo_t430_charger_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunivepusage.epizy.com/suluvuwonuluvuvogobejif.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/59638162294.pdfIn PDF document text
    • http://www.readwritethink.org/In 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_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 5252 bytes
SHA-256: b0c415237c1d988f5f78df1ead89a890d8480295280b142bd554621bf3c0f1d1
font_01_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 11436 bytes
SHA-256: fefd949c771940b7f9103d58f25bc2b16a0b3d6e65aacbf96b64d6403faaed07
font_02_sfnt_off000142f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 16064 bytes
SHA-256: c6ac4a84b806783e63ed337407dfaf73f0da8c9c1108f85aaf60181f94c2b64b

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