Malicious PDF — malware analysis report

Static analysis result for SHA-256 b440acfa6204f07c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 19:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4f2581fc5620ee3935f29e6a95469a0 SHA-1: 05b509283ecc8452acd96b37272f7f7be9a0dfd2 SHA-256: b440acfa6204f07c8b7a4ce7562edcec07674b1d96c1c0a59440a18e57df880d
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://travelone.ae/userfiles/files/5091690212.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/50472821589.pdf
    • https://rugsinc.in/UserFiles/files/52662236637.pdf
    • http://smsgurugram.com/miet/assets/files/budavapulapusenosofoli.pdf
    • http://esebtekstil.com/resimler/files/fiduxevoboxuja.pdf
    • http://nujhimachal.in/img/uploads/files/79648741649.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/gesogulowogajolilikumaje.pdf
    • http://aelma.com/sites/default/userfiles/file/sekiturapexumazevimejefux.pdf
    • https://bor-diing.com/upload/files/wemevekaverasabofofebilo.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/56004556496.pdf
    • http://lecostationery.com/files/file/53934082952.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/54206543217.pdf
    • http://sethhukumchandschool.com/userfiles/file/8022694868.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/vewabedobovorusitegejef.pdf
    • https://classykitchen.pl/web/uploads/files/retofojivowidaparezubaro.pdf
    • http://dongduong.net/Images_upload/files/lirijanevawuwebajazofi.pdf
    • http://hidramaco.com/files/files/49528547054.pdf
    • http://colafranceschi.it/userfiles/files/94617638058.pdf
    • http://backupcenters.com/userfiles/file/66590816820.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/ranimijudadivonejeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=amazon+prime+video+mod+apk+download+latest+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeac.bin
71eec4adc8343a03a1ba1bc0dfbea93794bbe3744fc8468d7fc5a26abec8c575
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAC 10836 bytes
font_01_sfnt_off0000c7c3.bin
c761be647c76a2b0b432aebb710711f600a48354a4fb580a658c9bd5feade4ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 19212 bytes
font_02_sfnt_off0000f902.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 16792 bytes