Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1971534aa875bf…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 02:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49d4a719783b193f717eedfb6d9a30ab SHA-1: 57caee2b305d0e8b8d1730ad3b9d8c8b3e683a9b SHA-256: 2c1971534aa875bf9beba0748c68c2761eaaf1934729b334ad42602dc1ab76eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links to other PDF files hosted on various domains, indicating a distribution or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://marcus-1.com/FileData/ckfinder/files/20210907_1C9597D27617F7E0.pdf In PDF document text
    • https://widerbet.pl/userfiles/file/depinabudopikuvuporewepob.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/revokoparuragupugodutu.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/vukefedemumevu.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/galafebi.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/11854952890.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/2683628263.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613109618783d---66040829040.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/97176610458.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/neligajene.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zogilulalamasid.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/zebozuvin.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/52583443896.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/27539143319.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/33890595220.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/96021323595.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210905_060511_6903.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/zumigisorig.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/vexajofobofesiwazilajeli.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18601877557.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/45142056624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=padmavati+full+movie+teluguPDF 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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 18324 bytes
SHA-256: c6182c292bf238b8e3b0175525a56d499d822222e850cc60fe4b63614229e0b8
font_01_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 10492 bytes
SHA-256: 8af86593a21cd850479a0e170f97ebe7ac6ab6e25426798436607e7459e80a8e

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