Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c9e162295304cf…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 14:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46e185293621ef6745aff092ec05251a SHA-1: a8c8652388c55ddea367848f5685fc0db7095b23 SHA-256: 98c9e162295304cfcc1ec35d7dbb9206e0c3d6c5ffc6d1ae28f9d9348c0d0193
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a fraudulent number. An embedded JavaScript stream was also detected, which could be used to further exploit the user or download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hotelniagararimini.eu/userfiles/files/wotegofovozokelupiwesis.pdf In PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabemenagolorepotigozob.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a5fe713e---taxigirimewiduri.pdfIn PDF document text
    • http://excellent-art.com/userfiles/95415597059.pdfIn PDF document text
    • https://31app.com/userfiles/file/xojokasaw.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/tozuwokatemobumawapapaz.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/8251214119.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/58885293617.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/51176565457.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/97099591193.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/zubafepurazatajevituta.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/88745269826.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/88542503469.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/kitikakepejobizulilemen.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210909_A5B7FA6A7EAF07FC.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/54248433040.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/romube.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/xuponasegolobabopupo.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/35067088085.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/49887250536.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/zatinosawizibixononotapu.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/mufonasug.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/gozoresawanogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+misery+of+job+and+the+mercy+of+godPDF 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_off0000b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 11224 bytes
SHA-256: eceda6afb3e313a5fd50e7e24a99bb11025f30400dde67bb0782cdc909fa293d
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 14972 bytes
SHA-256: 016e2027d748298e3188262f44b0e9a97db42a4d101fa829bec9d130d18948ac
font_02_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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