Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab655bfdc3583c…

MALICIOUS

PDF

93.6 KB Created: 2020-12-19 01:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c299308b950270a937acf8b528788784 SHA-1: 65dc3549ae6d045872acb297b8cf09dc82f13cfc SHA-256: d6ab655bfdc3583c6d03d46493c2d35bcf2bda3110a53e4718c42378d39a6c8d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=clases+de+actos+administrativos+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f9fbfec8a89a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_5fda5c1669ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5fca5843670b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fb91f044def6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5fa45b29a1ea7.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/rolutotawobizam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_5fb9fa65663d9.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/besigasefow.pdfIn 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/jenisozazewubo/samsung_internet_apk_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a6fa579eee3ae06f1228/t/5fcffb7c7b0a801071fa09a4/1607465853606/xadidumukogazolet.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/cap_full_form_military.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/classic_wow_lockpicking_guide_wowhead.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8151ac7e22a65153ef0/t/5fdd2c71f11f517dbba6a598/1608330354467/kifabepavupuwifa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/woxokinakerafuzedaporo.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/67933607180.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_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 5172 bytes
SHA-256: a9a24f56c499ec477fc0d8140706f296c8701b2ffbd69f9c676f6c1cf30fc118
font_01_sfnt_off000135b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 10848 bytes
SHA-256: b60baaf4ae979cc0cc7a796fac33217bec68c9c05100216edf12248dbce66033
font_02_sfnt_off0001591b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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