Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf777d774e6c362…

MALICIOUS

PDF

95.4 KB Created: 2021-02-08 01:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fd2645478d1c7bc4f9430c13dfcd0b9d SHA-1: 4f2804c3473e049f3b21276d0d24d7282a8fd2a7 SHA-256: caf777d774e6c362055da3a529c3d2fd483994ca856025ca872937fd5b9c24bc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting or unknown domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, includes terms related to search queries, reinforcing the lure of finding specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://jottigo.ru/wb?keyword=precalculus%20with%20limits%203e%20pdf%20chapter%204 PDF link annotation
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/gapezut.pdfIn PDF document text
    • http://indohealth365.online/6630766820i1qsi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_600c747719d3f.pdfIn PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/lisukato_sulesuruwisivu.pdfIn PDF document text
    • http://xilagima.66ghz.com/34748394094.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/zigujujimaken.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_6000b3c66484a.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/9008272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393785/normal_5febe0559dab5.pdfIn PDF document text
    • http://www.LarsonPrecalculus.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kizugokofo/poweredge_t440_spec_sheet.pdfIn PDF document text
    • http://dijinisefiregot.rf.gd/54856195733.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/getuwobikak.pdfIn PDF document text
    • http://gukedam.rf.gd/kozeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/49346732310.pdfIn PDF document text
    • http://xegiseko.epizy.com/detenumive.pdfIn PDF document text
    • http://mubaviz.epizy.com/luxury_gift_guide_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 5408 bytes
SHA-256: b9687c0fac197f0f69936c9de70bf687fffaf644c3690b4f83478e8a529cf073
font_01_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 10616 bytes
SHA-256: 583c5e6d655352ec157507a78eeca41260e51ceb4936fd83f4adde0b8acfd478
font_02_sfnt_off000161fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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