Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6672542a2e38e8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 07:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8caba7dd1b672a0311f47039f5c4ff0 SHA-1: e1ce523fc4fec7ad322190f2fefe5e9484245419 SHA-256: dd6672542a2e38e8c0a85fa51cd827aa80a760fc9484ea829abffa578a7d46da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://keepingscore.org/userfiles/file/pazukijugiwibinogodowelem.pdf In PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_B7D2775DF2CCAB44.pdfIn PDF document text
    • http://exosushi.com/uploads/files/dobategigowutesope.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/93885061875.pdfIn PDF document text
    • https://kawanmto.net/contents/files/gafefimavi.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/89357353736.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/2528322279.pdfIn PDF document text
    • http://safarang.com/basefile/files/74925503353.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/35924058337.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zijozar.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/69629369249.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vunerejewefoketujuli.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2652974529.pdfIn PDF document text
    • http://cocoal.com/uploads/file/4508516549.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/34442612484.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/98333629521.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddac85b65---43942659380.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/sodekupamekepuvin.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/bikogijosoz.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/16517662660.pdfIn PDF document text
    • https://businesslife.com/content/file/14223869689.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/94786062834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mi+redmi+note+10+lite+price+in+bangladeshPDF 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_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 18436 bytes
SHA-256: cb231cd0588c3daecbe4be872bff1f25ef7946cadd26e57098c727fe5ec76af7
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 11268 bytes
SHA-256: f5f161005ac642fd83798f6d5f284761a999e7887be6e19064416ba81a486114