Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bb675e9f2eac4b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 02:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1efb836d38b373ccbc5cf41501ee2d8 SHA-1: 4d37544e114e2f458a0762763cbac91adefd5b92 SHA-256: 49bb675e9f2eac4b86653e293f8efc8160df7e994358c1bc4b8f659fcfcdabe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous external URIs pointing to various PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pistant.ru/uplcv?utm_term=greys+anatomy+book+pdf PDF link annotation
    • https://khonggiansachhanoi.vn/uploads/files/56009236748.pdfIn PDF document text
    • https://lecachet.fr/docs/files/72777719505.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/jaranivav.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/bedoxina.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/32330837188.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_6F67E2D0F26F248C.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/53978318569.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5aa89b36---xapanogubolanasu.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/44632108671.pdfIn PDF document text
    • http://dd-eng.com/files/files/sidanidavanusapa.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/74706826193.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904230648_1844872301.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/18004168370.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/tefogokifubi.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/natilutujafukeka.pdfIn PDF document text
    • http://pk.mo/userfiles/file/furepugepukogepebew.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/82735381874.pdfIn PDF document text
    • https://medius.sk/userfiles/file/99298425086.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57299474293.pdfIn PDF document text
    • https://derfo.info/resimler/files/82208281383.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/56438573196.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xezawuvedemut.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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 17568 bytes
SHA-256: 069c2a4a37719fe49f4b25fb37051881e5423e3503ee39772a775a3f29aebe4d
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10904 bytes
SHA-256: 0b150c2de11bdee8188da8a3942d7f0f77fdf76b12378b7092a2297c638dc39a
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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