Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8c547a186ba065…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 05:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2be075cfb8069f984f273a253f41c300 SHA-1: 14d75e21b4e92da9164aba7ec7365b41cd290fbd SHA-256: 5c8c547a186ba065dfe11aa0902dc22903ab48aafd33645e7102848add163dc3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying a link to an algorithmically-generated URL on a disposable domain. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it is likely a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=my+otg+is+not+working+on+my+phone PDF link annotation
    • https://coevent.ru/upload/files/woginiwumosimomimagog.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/topewapizawinime.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/88512033804.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/nupotarex.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/biwuxofuluvot.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78c33d44b---nedugumifisosi.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/53821258579.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/14805065346.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nimuv.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/kesapewotuzifowo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7428b71f5602ff0b278201b80166795f/powefibixiposokubosizijis.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/56070009720.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/37772149362.pdfIn PDF document text
    • https://mangallagn.com/images/file/sakeroruwurulipabefexotej.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109031003304046.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/kivolelonibojorugibam.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/42813901903.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109010921068133.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/60155580261.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/10912325172.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/kefizenelamowedoj.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/nuziverewo.pdfIn PDF document text
    • http://canadianrockies.info/files/file/bemugoroka.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/zomubelokaleromufow.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://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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 18052 bytes
SHA-256: 4ea8e5c6fa838c05429bfb294693ec8c89e33a7dc8f11b0838d6173cf47df46f
font_01_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 10776 bytes
SHA-256: b15395e9bb65b8ff84034a324aace867b8219365cb43ad4287c16f5dee791caa