Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f7694a3888a7fa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 15:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7b8d12e91794af389e5e440985414cb SHA-1: 1df8f16819cd5d94b3f1e8dc52a79f16ea4be791 SHA-256: 51f7694a3888a7faf5a2fc3db15676515147b3e9e52da95512b8ce079452ef49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the PDF's primary purpose is to redirect users to a network of potentially malicious websites.

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://chekeeh.ir/basefile/chekeehir/files/ruteludijitoxefegep.pdf In PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/lisojat.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/jedadoludul.pdfIn PDF document text
    • http://firegallery.ru/img/upload/44945776466.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/19684226324.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/gevotib.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/82383582405.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/56057181797.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/55682664461395ba27fb31.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/sukizulinolofopavib.pdfIn PDF document text
    • https://theurbanthinktank.com/files/32265520879.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee246c12bd---gexukunojolavebive.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_004911.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907131124.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/muwamebi.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/90373204689.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/lekowisepofuzajumiwid.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/54149367713.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_96C1CD04E37B78B8.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/fisawotosilutozamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=malayalam+movie+torrentsPDF 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_off0000bd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 17096 bytes
SHA-256: 282376c0aa793de45c2ac3f1b2a9587178e270e6045ed7224a2031f2f9d8b23a
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10440 bytes
SHA-256: 58b3f8259eb29fe10ad6a81ba2ddf6070dcb8bcb440625005118394deac5fccb
font_02_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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