Malicious PDF — malware analysis report

Static analysis result for SHA-256 5336657012fa7385…

MALICIOUS

PDF

87.0 KB Created: 2021-03-25 18:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33cf0827bfbbaa274e5e8a8a2aec4de5 SHA-1: dd1a74e41bdca168799087571a619fd57b8accdc SHA-256: 5336657012fa738510e33c0960fb6713df98bb772a5e1f528d3a90ca1483fe33
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing attempt. The embedded URL points to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit vulnerabilities or trick the user into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=metabolismo+de+los+carbohidratos+pdf+unam
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/606998.pdf
    • http://nomenowunesazoz.scienceontheweb.net/kujoborepazez.pdf
    • http://digosige.mywebcommunity.org/zuzizudig.pdf
    • https://cdn-cms.f-static.net/uploads/4379731/normal_604af8b9daeb1.pdf
    • https://cdn.sqhk.co/dunafafaxen/djf5ugd/jaxaminaguvufodune.pdf
    • https://cdn-cms.f-static.net/uploads/4404520/normal_60490ab985cac.pdf
    • https://cdn-cms.f-static.net/uploads/4413117/normal_603d221929510.pdf
    • https://cdn.sqhk.co/xuxovunevo/jevjcak/47220671803.pdf
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/fuvega.pdf
    • https://nepikazot.weebly.com/uploads/1/3/4/5/134526085/2080936.pdf
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fe5b91528637.pdf
    • https://cdn-cms.f-static.net/uploads/4480187/normal_602b11783509c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75924900-787c-410e-9c3c-3c71bc112762/how_to_program_wildgame_innovations_feeder.pdf
    • https://uploads.strikinglycdn.com/files/c0921d8f-1a19-4abf-beed-1cadaaa7aaa2/international_finance_graduate_jobs.pdf
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_a7ce076e37364b419931981362c54110.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_dc866d85ac194f8c89eae1cfa11918c2.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_44c449e288f8489f8168c2e91751e07e.pdf?index=true
    • http://forezepolutaju.onlinewebshop.net/research_method_in_psychology_ebook.pdf
    • https://uploads.strikinglycdn.com/files/0176e442-770c-418f-8bcf-849697da207b/58195871888.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_off000116cd.bin
e98ea47e5a343813598cc6859863d6488ab960a21cb25155dd646bd83f31fe10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 5540 bytes
font_01_sfnt_off00012978.bin
894d6ea1a61a19dd1421ac59abdbb34562e83eb7c73cfee88a2a1de8fcec9d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10976 bytes

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