Malicious PDF — malware analysis report

Static analysis result for SHA-256 8834650141218865…

MALICIOUS

PDF

86.9 KB Created: 2021-03-28 09:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48a87e98658a2665724b455a6d093f5b SHA-1: a506d119d4b62a6470d27ca8f63baf5e9dba178e SHA-256: 8834650141218865b1eb56ca6255f12e7271b2fdc95ad5fd36690561a5cb0def
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, suggests a lure related to "green book script pdf".

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=green+book+script+pdf
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/9890393.pdf
    • http://juborad.mywebcommunity.org/the_contemporary_astrologer_s_handbook.pdf
    • http://soferijivav.getenjoyment.net/jikabo.pdf
    • https://semizafug.weebly.com/uploads/1/3/1/8/131871859/pavisuza-fijijek-bupif.pdf
    • https://cdn.sqhk.co/gusisezepemu/h3XZdib/moldable_plastic_sheets_cosplay.pdf
    • http://bawazofo.getenjoyment.net/ebara_absorption_chiller.pdf
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fcd9831c0cc5.pdf
    • http://lonemap.medianewsonline.com/adenoides_pediatria.pdf
    • https://cdn.sqhk.co/xamowizaso/qvgdREu/zelila.pdf
    • http://midunetojonawiw.mywebcommunity.org/deadlock_prevention_in_os_tutorialspoint.pdf
    • http://gazeloguxa.22web.org/70915725188.pdf
    • http://bifilazona.22web.org/65704479571.pdf
    • https://cdn.sqhk.co/kupawusel/tgihi3i/62923124761.pdf
    • https://cdn-cms.f-static.net/uploads/4368243/normal_6046c3ad570a3.pdf
    • https://cdn-cms.f-static.net/uploads/4424027/normal_5fd92e46656c8.pdf
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/gapijan_nirigodewuz_rewizawoteje_nebat.pdf
    • https://cdn-cms.f-static.net/uploads/4366654/normal_604f4603682c4.pdf
    • http://pefiworawodud.mypressonline.com/components_of_empirical_research_and_examples.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mebapuperepomuv.rf.gd/lagu_baby_shark_doo_doo_original.pdf
    • http://vovojoj.atwebpages.com/200_gramos_de_harina_a_ml.pdf
    • http://rafelisugamiraw.rf.gd/epson_stylus_nx230_service_manual.pdf
    • http://nivajunupoz.epizy.com/jovubonufikusam.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011770.bin
2122f85dae19334e8f761010f71779b3efe8a9ef402b8a615b15d50a66945bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 5144 bytes
font_01_sfnt_off00012906.bin
3c6e4b4b14b3b71c91a39f199f856823a94ac115c5b39f4c925104bbe5e96789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 10948 bytes

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