Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f445f3ba881fddc…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 02:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03bbf215594fd0df908266232012751e SHA-1: d7f147d3f0553fe9ef10188f30ed976647dc0fd3 SHA-256: 3f445f3ba881fddce7821ecd1465d37dfa1b51ea11330bca1f21885b2d1f7458
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, suggesting a link farm designed to redirect users to malicious content, with one URL specifically pointing to a PDF file. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can be abused for malicious purposes.

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://resalured.ru/wix?keyword=multiplying+polynomial+equations+worksheet
    • http://nncucuucuc.space/opel_cascada_preislistet7drs.pdf
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fec9425dc9be.pdf
    • https://cdn-cms.f-static.net/uploads/4411491/normal_60419eea4bd0e.pdf
    • http://twitter-center.com/birthday_party_invitation_template_whatsapp0zl8z.pdf
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff04b10dd702.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://yewes.space/60871538881ujj2b.pdf
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/difotisobo_fesibagifegetel_bujopekevukapaw_bagavaxese.pdf
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/bfebf4a0a4.pdf
    • http://health2health.online/what_are_the_8_steps_of_critical_thinkingapp1x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://minuwugonobusuw.epizy.com/kipinisukobemuketejakok.pdf
    • http://jabaxuzadowepep.rf.gd/timok.pdf
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_865fd88aaa744dada01946281d60bd7a.pdf?index=true
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_a7f7512fd5784148847d0dc4558f4ecb.pdf?index=true
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_dab421690bf54a528401531fbb6508d9.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_206abb13230e46c090b97401c38ec989.pdf?index=true
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_b780cbc50eb84345bf284b507e72e05b.pdf?index=true
    • http://fekirufelite.epizy.com/39642686233.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_9c1d8c68d8b749148053b8547f17a140.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_41f9ea48fdb14069b2267a1642115510.pdf?index=true
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_6f69066d119c4a0cb705015d43754f82.pdf?index=true
    • http://gusukeru.rf.gd/38405529435.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_off0000e5e4.bin
110add2462ff6fc43420eb5d760319c1ee3e6766f2f521dcb16e0ad9bd624acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5624 bytes
font_01_sfnt_off0000f8fb.bin
0ab7a2e104fc346c9fe2565ac52b85c9a3ffed75eea6d8dc7c5b8647f7ad5324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 10780 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.