Malicious PDF — malware analysis report

Static analysis result for SHA-256 a360caae70f697dd…

MALICIOUS

PDF

96.3 KB Created: 2021-02-17 01:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 826995bf62637bcc95a629d8f30a5dbd SHA-1: 9123f42f6dec3ce3816420a98283a65a005ae446 SHA-256: a360caae70f697dd9daf62c6399f33e7becb4c528085a234df85dc633cdfe703
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of a 'download' lure and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=install+apk+through+adb PDF link annotation
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/metejetibezumoxesil.pdfIn PDF document text
    • http://helpcopyright-service.com/rimaboxose5s18l.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/5aada1392f2916d.pdfIn PDF document text
    • http://tegor.xyz/bloom_s_taxonomy_lesson_plansjzp2o.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/cdfa5adb05ec.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/14b1849b.pdfIn PDF document text
    • https://lewaxirilukuxod.weebly.com/uploads/1/3/0/8/130813115/zirufedirenipewevip.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/functional_currency_vs_reporting_currency_us_gaap.pdfIn PDF document text
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/26c2c94722bb.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/abbyy_finereader_11_free_full_version.pdfIn PDF document text
    • http://mexicotop3.xyz/dragon_quest_9_vocation_armorzs93n.pdfIn PDF document text
    • http://vejofewi.iblogger.org/correct_spacing_for_format_business_letter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xojafemori/pekikanulenilovitanuroj.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/86371676503.pdfIn PDF document text
    • http://luzawuwu.epizy.com/triumph_bobber_black_manual.pdfIn PDF document text
    • http://luvebex.rf.gd/berutavubuwijajubisezuta.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/exercises_for_neck_arthritis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 5364 bytes
SHA-256: ad1e07fd9c22cad025c7ce5dda45eb3b85c320736d9805cff7f4aacd97c23d6a
font_01_sfnt_off000148b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B9 13272 bytes
SHA-256: bcef41f3c2ab3737b92c0dcc31dd55e622435132b1695f0e000594d159c08979

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