Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc57130c6d60fe…

MALICIOUS

PDF

70.5 KB Created: 2021-03-28 10:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7ac7120587c3652da52b30b774a322d SHA-1: d974b45b9825187c1103aa5755b965474184b6c7 SHA-256: bdfc57130c6d60fe92d2944baa7bc16cc50f4b70a3453a52a703488d715f11df
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to a URL that appears to be a phishing lure for 'parentpay sign up'. The presence of a link farm heuristic further suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=parentpay+sign+up
    • http://lelofewadu.iblogger.org/que_es_el_contexto_situacional.pdf
    • https://dabefetuxof.weebly.com/uploads/1/3/5/3/135320161/xifeku.pdf
    • http://madewithsunshine.com/rugivejz1rlu.pdf
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5fceb5ea76a13.pdf
    • http://podarokinsta.site/18516373072kf0z8.pdf
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/ee2ce40eafeda.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_60462c54aa010.pdf
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/7246396.pdf
    • https://cdn-cms.f-static.net/uploads/4394082/normal_605895b5a535c.pdf
    • http://polnews.xyz/xaxarovaloxuxianwix.pdf
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/8848527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadupazageraf/40705762466.pdf
    • https://s3.amazonaws.com/pusori/dukefeso.pdf
    • https://s3.amazonaws.com/kobivimelelo/how_to_write_a_skills_summary_for_a_resume.pdf
    • https://s3.amazonaws.com/furunumaroxun/78786988452.pdf
    • http://sajonagot.rf.gd/21823957208.pdf
    • https://s3.amazonaws.com/tojazudibumogab/dumasetujejo.pdf
    • https://s3.amazonaws.com/fajetufekejo/secretarial_audit_report_2019.pdf
    • https://s3.amazonaws.com/sirilagewuga/59620057530.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/cash_flow_statement_format_as_per_icai.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_off0000d92f.bin
5861d8acb250cbb6a8732147431df8d0f950b683947ff6ab1875afd773027517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5060 bytes
font_01_sfnt_off0000ea80.bin
5db4dcf84e4a34658424f300ad757ffd9460ce7e2804d2b64e04bd70cb9434ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10140 bytes

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