Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcc247bb611b258…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 07:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0b508de0e61e2101f65606ef731d539 SHA-1: e24e2c52f63c916b21626c0e7e09bd4f1b1fd4d5 SHA-256: 3fcc247bb611b258f465dfde54b5c0232074f4f9baba3979da4f49a9af30ff99
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=hip+hop+beat+maker+apk+download
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/61800724951.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/dororukurexi.pdf
    • http://ned.ru/uploads/files/medokuvosusuwameketepov.pdf
    • http://lexen.ca/userfiles/files/13811776857.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/rozulozepujomivubi.pdf
    • https://joinvita.com/neu/userfiles/file/sanezovenejagukij.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bc960147---70013414384.pdf
    • http://hmed.vn/upload/files/24965274124.pdf
    • https://academiapreprod.riportico.com/userfiles/files/54111304851.pdf
    • http://hoaisonland.vn/upload/files/liveboxediv.pdf
    • http://ambvetsanprospero.eu/userfiles/files/53934937073.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/8937593399.pdf
    • http://uptindia.com/newsimages/file///82661606508.pdf
    • http://upasamed.org/Content/uploads/files/timavikek.pdf
    • https://femagnet.com/upload/edu/article/file/46689933851.pdf
    • https://naves.cz/res/file/zurela.pdf
    • http://seychelles-resort.com/images/blog/file/linugow.pdf
    • https://alsultantrading.ae/userfiles/files/lokuzilaronodujebed.pdf
    • http://gelinyuanyi.com/upload_fck/file/2021-9-12/20210912085441865475.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345f475b438---jenedikuw.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/23031819863.pdf
    • http://zhongguohuachun.com/d/files/tijorenifudiliz.pdf
    • http://sudeoksa.net/userfiles/file/20210910141545.pdf
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vemapibuja.pdf
    • 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_off0000d395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16792 bytes
font_01_sfnt_off0000ebac.bin
bed0c9c24d6558ec283fd84f3c0900fa5452a12e821ec477e8b28b7440829342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10800 bytes
font_02_sfnt_off00010411.bin
55633cc3c10c28c311cec8cf39a4fa671573a6be5f3384773f69f154d3960174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 18404 bytes

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