Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ddbf772583d2ce…

MALICIOUS

PDF

74.2 KB Created: 2021-03-29 00:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 908bb1e793fe75a5d1dad9a579f30e74 SHA-1: dfb255d6c92b022e2b496440d4a6c166e7113ea1 SHA-256: c6ddbf772583d2ce2287b86b27b7c0526251f17d5f4ab7ce780bc314423b6581
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple suspicious URLs, including one directly linked to a heuristic firing, suggests the file is designed to redirect users to malicious sites for further exploitation or phishing. Although no scripts were explicitly extracted, the PDF format and embedded URLs are commonly used for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=modern+optical+engineering+the+design+of+optical+systems+pdf
    • http://eeeeeyyy.space/jimibipajirosusazogexpelqx.pdf
    • http://ru-payment.casa/vujafimuzmlvdw.pdf
    • http://wokanetavim.iblogger.org/need_of_working_capital_management.pdf
    • http://dominis.xyz/18300046944k6aam.pdf
    • https://static.s123-cdn-static.com/uploads/4454419/normal_5fe1c993906ce.pdf
    • http://naropiwazufilu.22web.org/regilexevomigurovug.pdf
    • https://cdn-cms.f-static.net/uploads/4494875/normal_605f78d1957cc.pdf
    • http://gtomishebs.xyz/shark_attack_hungry_wolf_bbqyjs3e.pdf
    • http://fishland.store/966476526681xtfk.pdf
    • https://cdn-cms.f-static.net/uploads/4423728/normal_605531a5276ad.pdf
    • http://baranaydin.org/vewunuruvosumojnnlxq.pdf
    • https://static.s123-cdn-static.com/uploads/4464996/normal_60088f9b4797f.pdf
    • http://belldiscount.ru/numerologia_cabalistica_emcf0ui.pdf
    • http://yellownatural.space/assentamento_rural_e_reforma_agrariarme7t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_44a835b7c3a645e2ba17015dd3df1e11.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_98ec8e5c095344b18102e5c2f0fabcc3.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_9cb2be773f874f46841771cfb3650928.pdf?index=true
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_839bd17c9d32417aae04bd30bdb8d3ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39dca1f2-c13e-4584-9ce7-b2faacc2d7be/64360565128.pdf
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_64163fafcd6745009ded784baab05ee9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2d30607-ad09-49d1-87f2-8655a597cdc5/herbalife_shaker_cup_instructions.pdf
    • https://uploads.strikinglycdn.com/files/4b9a335d-c716-4376-90c2-8d357b838a29/how_to_edit_on_elgato_hd60.pdf
    • https://uploads.strikinglycdn.com/files/b633aeff-0d15-4014-a0b6-e963864cdba6/rosinosemususisaw.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_off0000e462.bin
0a2b18b97e96f619970225b656eaecb1c5fc5da1f4cb8e8d0eadfaebf182bb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 5676 bytes
font_01_sfnt_off0000f79c.bin
b10859b86a86fb31c2420e141adcb2b69a717cafe5c9c6a42ace86fda1bb370e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10192 bytes

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