Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd652e46ed1f341…

MALICIOUS

PDF

77.2 KB Created: 2021-02-27 16:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ab61dbe7d8efa63f1cad81a50080715 SHA-1: 1290b68055a12c633ab7dc73b2202dcf8125530b SHA-256: 6dd652e46ed1f341b594844b28d410471ff1aece34d6054f1fe00959bd401250
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/wix?keyword=ribbons+of+hope+pageant PDF link annotation
    • http://terem.space/wosajekemakys5ty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_5fe66e0429488.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/a4e63759d57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5fde5e1bb159e.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/dafonuw.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/how_to_change_font_size_on_brother_p_touch_pt-70.pdfIn PDF document text
    • http://lyudi23.ru/92432238470x3iyj.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/wupixufekijax/denote_vs_connote_worksheet.pdfIn PDF document text
    • http://xalolowoko.epizy.com/rizimurixuvijorijewiw.pdfIn PDF document text
    • http://pamajaxa.epizy.com/93711599471.pdfIn PDF document text
    • http://dapigeke.rf.gd/tp-link_tl-wpa4220_price.pdfIn PDF document text
    • http://duzatip.rf.gd/dorupawuxiliferafog.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/30518176653.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/behringer_x_air_xr16_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/wabanesaneturaxuze.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_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5180 bytes
SHA-256: 77bf597068c01a34c0e555926b09a0d9c444d56dd1cc9c671913b9769a524e36
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10136 bytes
SHA-256: 2a08ad8458c71ae9a4c1b4fecf1dcbc9de2f9376b4fd56dbdc7eb0146e93d29b

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