Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc81c0a32eb22b4…

MALICIOUS

PDF

73.8 KB Created: 2021-03-30 04:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08b46ff59cbc0c0cfdb5c6157276d43b SHA-1: 2ab6d5a30cb6ce8c3bba59331d07205944fe0c88 SHA-256: dcc81c0a32eb22b49172d7007de78027ac9a38b66acb7afaae9ab81b08ebcc0a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and likely phishing-related. It contains a large number of external links, forming a link farm, with the primary URL being zajinet.ru. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=java+a+beginner%2527s+guide+6th+edition+by+herbert+schildt
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fed1733e5eef.pdf
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/vukopa.pdf
    • https://cdn-cms.f-static.net/uploads/4493602/normal_602f420d83298.pdf
    • http://xovebud.mygamesonline.org/vawalagibenototelobu.pdf
    • http://rmk4sale.xyz/834023949158ipd3.pdf
    • http://italywow.info/pujetopifilomutabinujodafsdxqb.pdf
    • https://cdn-cms.f-static.net/uploads/4419626/normal_602967c60d5d8.pdf
    • http://palikexifumalam.mywebcommunity.org/bamexemeb.pdf
    • https://wujadadi.weebly.com/uploads/1/3/1/0/131070572/woxefowepa_dakusozisu.pdf
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fc89c7dd8cb3.pdf
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fde45b79c9c7.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_603ad1cc6751b.pdf
    • https://cdn-cms.f-static.net/uploads/4480170/normal_6053163324d8b.pdf
    • https://cdn-cms.f-static.net/uploads/4393188/normal_601197c6dd05b.pdf
    • https://cdn-cms.f-static.net/uploads/4487658/normal_604612911d1f1.pdf
    • http://vumamanepu.sportsontheweb.net/how_to_write_a_book_summary_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4474206/normal_6031c06477209.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zotubune.myartsonline.com/2017_ford_mustang_gt350_hp.pdf
    • https://s3.amazonaws.com/wekibik/82830218884.pdf
    • https://s3.amazonaws.com/lovetijif/idl_reporteros_codinomes.pdf
    • https://s3.amazonaws.com/fomaralunex/kinadu.pdf
    • https://s3.amazonaws.com/juzewojavomofew/authentication_problem_android_wifi_sony_xperia.pdf
    • http://vexolofifete.atwebpages.com/sewing_book_download.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_off0000de2c.bin
a2ed7ed5d0992873b81618053caa526fcbee6bcfd14c5b0f48e800c971c6b368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 5680 bytes
font_01_sfnt_off0000f199.bin
e414edeb903d6cf34d066ce6485161dbecc125d9d88f916832e7a8266021aa33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 11256 bytes

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