Malicious PDF — malware analysis report

Static analysis result for SHA-256 433ffe7e09740a85…

MALICIOUS

PDF

82.3 KB Created: 2021-03-10 19:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fb7cffffb55568b4d3678e988a1d4d2 SHA-1: 2cae2ff497f4ac1550abd8badda5da88c17a7e56 SHA-256: 433ffe7e09740a85917fff6dbbf6f1e32128ffea90c49bc65f0f2b8f86e675b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

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-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://ponafet.ru/award?keyword=alain+badiou+plato+s+republic+pdf
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/55a90f51b72.pdf
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5fe15ef27140b.pdf
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/0a77e4b3ed6d.pdf
    • https://jubojavinuduv.weebly.com/uploads/1/3/4/3/134316702/lunosapuxaturesipopo.pdf
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5ff5f95e04b99.pdf
    • https://static.s123-cdn-static.com/uploads/4381094/normal_6000755814590.pdf
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5ff27e579c157.pdf
    • http://jotelefaxomawut.22web.org/1938930394.pdf
    • https://juxejiwivila.weebly.com/uploads/1/3/4/7/134713499/2482470.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/libusamagowuvo/rororepekafoji.pdf
    • https://s3.amazonaws.com/satulibaren/worusetilofofipevokikif.pdf
    • http://zebikijixikemas.rf.gd/amazing_wallpapers_free_for_mobile.pdf
    • https://s3.amazonaws.com/xotomisen/jukanawudeboramosara.pdf
    • https://s3.amazonaws.com/dikomavomem/53852264316.pdf
    • https://s3.amazonaws.com/xezonijida/2531726122.pdf
    • http://raraviwikemuliz.epizy.com/cant_open_realtek_hd_audio_manager.pdf
    • https://s3.amazonaws.com/lodazojamuva/temperature_conversion_worksheet_with_answers.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f617.bin
a497fc52ef216d2369a1cda088bdeb49e1b2edea4e2999984a7939df6a238a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 6416 bytes
font_01_sfnt_off000105e1.bin
6c7cfa0efa9208ceb4a2d1a6e87145a85fef6b81ad0641cad7eda626d3156edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 5276 bytes
font_02_sfnt_off000117db.bin
f09539dffcc7c8518a0f8a0c96435552c580d132f51f72afd00d15d15a1b08af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 10964 bytes

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