Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f5c191a4e04130…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 02:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 03f1a0ee754d930551da87d62df343a0 SHA-1: 804532d8b7999be3c6887a768a79438721aba678 SHA-256: 88f5c191a4e04130b6d9ac738c07c33fd8b5391311847bf3f575fc73b172d859
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://fipjp.com/userfiles/file/bugevikosopudar.pdf In PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/lupujuvuloxo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a670ff19ef---xuvarenunuxes.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/diwikafezarupo.pdfIn PDF document text
    • http://lagrupacio.cat/file/zisabadivorutemewukigafo.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/60347826765.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/38033888736.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/debururepunapidimusego.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9cbbf0khprvedm6llu76f03vp2/lavepilip.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/44236264902.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904043733360929.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/60355706136.pdfIn PDF document text
    • http://electric-kernbichler.at/21123156736.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/67527691890.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/74683014886.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/wapozagagotanarobavafux.pdfIn PDF document text
    • https://grnca.org/img/files/files/67663292125.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/rugimusavudizojimaje.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/wisalonogufazagutep.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/10566465236.pdfIn PDF document text
    • http://anpharma.net/upload/files/masetej.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/butufaxaronim.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109091632308399.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/98386022298.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/kirebinimaziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+scan+qr+code+of+wifi+in+iphonePDF link annotation
    • 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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 10896 bytes
SHA-256: 3b3c9e3fe62631b543fae8ca20f7e2015894eae1754dcc519d290016eb68f7f0
font_01_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 17556 bytes
SHA-256: 78847a9cdff29261900a548620d31e6844901eb20e746d4282b5929b8824c30e
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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