Malicious PDF — malware analysis report

Static analysis result for SHA-256 52820dcb7bea6964…

MALICIOUS

PDF

89.0 KB Created: 2021-03-22 01:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a960496f4fad5c3effd2626b2fd24140 SHA-1: d657074eae41bd0f8e139d19d5842bfeecbec14d SHA-256: 52820dcb7bea69647bf2fd95a92b2057f904225d52dc2ba0cc85059baebf1fcf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are numeric slugs or appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign, likely involving redirection to exploit kits or credential harvesting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/wix?keyword=air+on+the+move+science+worksheet+answers
    • http://zozuwax.66ghz.com/17447116842.pdf
    • https://static.s123-cdn-static.com/uploads/4445115/normal_5fe0a05dced63.pdf
    • https://cdn-cms.f-static.net/uploads/4423452/normal_6044cbcdcb438.pdf
    • http://soldatskaya6.ru/596120832458l1aw.pdf
    • https://cdn-cms.f-static.net/uploads/4418171/normal_602c56d4eb857.pdf
    • http://teaapple.space/android_file_transfer_pc_bluetoothvgcc2.pdf
    • http://xusakarezexalu.iblogger.org/38260465529.pdf
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fdc0c3a791c1.pdf
    • http://alisaborodaenko.design/jojoguwezekifod2anjm.pdf
    • http://tihefers.online/genel_kimya_vize_sorular_ve_cevaplaogc5m.pdf
    • https://cdn-cms.f-static.net/uploads/4471946/normal_603fac4e4b297.pdf
    • https://static.s123-cdn-static.com/uploads/4407057/normal_6001cb6f38c8f.pdf
    • http://ideaita.fun/73406451027g99pa.pdf
    • http://craftsmansmetics.com/loving_vincent_imdb_parents_guidetsh53.pdf
    • http://zivudib.66ghz.com/constitutional_convention_crossword_answers.pdf
    • http://probmake12.xyz/budget_speech_2018_south_africayngqg.pdf
    • http://letgtma.bid/jedepebityt3vv.pdf
    • https://cdn-cms.f-static.net/uploads/4458137/normal_604da663328e0.pdf
    • http://nncucuucuc.space/44165569538dawjx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_2d7bcd505b6f4c948d9d901877b64b18.pdf?index=true
    • http://buwozefavimim.epizy.com/4413409424.pdf
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_b78f716dd4e7475fa27a001e328ac3c2.pdf?index=true
    • 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_off00011def.bin
ee636471edd6907fe5d76cb936da76d82136b44e6231f2426895f2050607e616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 5212 bytes
font_01_sfnt_off00012f92.bin
dd859dc7357d760ad1dd42394c6fa5eead90000764d069cb5d11aef5be71d3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 11380 bytes

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