Malicious PDF — malware analysis report

Static analysis result for SHA-256 8effbfbc960ce1a8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 11:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73a113aa002a6508b5d9b35df9226984 SHA-1: d2a7d9e0effd99f556c929aaa1181b6f8364c721 SHA-256: 8effbfbc960ce1a8cc26387d33803fb72a307801e5eb32d6f6e2362182a34f1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ahdongjiu.com/upload_fck/file/2021-9-9/20210909155922994796.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/65356714370.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/97042592852.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/63190408402.pdfIn PDF document text
    • https://norservis.cz/files/files/11934588154.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/59897057082.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/73026638930.pdfIn PDF document text
    • http://orlickachata.cz/files/files/mafapevenamurotowip.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/rupowaveresalelabapoxutas.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/62040027731.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/vutiken.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/8013293143.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/fuduborajigisalaredaro.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/xageligamaraweminug.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/zipasotuvu.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/lelezetimegexuka.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499a8727fe---671587875.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/jonokesisoriwo.pdfIn PDF document text
    • https://europartner2.pl/uploads/nalajaputuze.pdfIn PDF document text
    • https://solturism.ro/images/file/samazogarid.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/dokaxuboze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+maker+app+download+for+androidPDF 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_off0000b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32E 16472 bytes
SHA-256: 0b548737a005fa4d16e6a31a32eacbd3ec5bd8b2edd0fec1ff98a3a1fbe99bb0
font_01_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10572 bytes
SHA-256: e5aa5871853fdbb61df034c8e1286ca559a8efde679fe4b336d74a1940a47a15
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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