Malicious PDF — malware analysis report

Static analysis result for SHA-256 5367ff73cb6ec34b…

MALICIOUS

PDF

70.7 KB Created: 2021-02-22 06:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5b614ec73bd8556d06ddce22625342a9 SHA-1: 8116882e05f00c4b5a0b95ee2cbdf0e72c7be0ab SHA-256: 5367ff73cb6ec34bf5e67f837d4efb6bb77560a51110ad7ae25f96488fe9b51a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. One of the external URIs, 'https://jottigo.ru/strik?utm_term=mark+batterson+if+study+guide', is flagged as suspicious. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely acting as a lure to a phishing or malware distribution site.

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
  • 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://jottigo.ru/strik?utm_term=mark+batterson+if+study+guide PDF link annotation
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/2522475.pdfIn PDF document text
    • http://banoduber.iblogger.org/nikon_n80_manual_rewind.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/bodajaku/iit_delhi_gate_2020_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/13580858655.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/96856910434.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/44528065331.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/swiggy_business_model.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/cute_baby_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/xasutosepi.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/jagigawidameru.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/faceing_math_lesson_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/dyspepsia_guidelines_2019.pdfIn PDF document text
    • http://dusipesubabaf.rf.gd/44141352807.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/capital_bra_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/tofaziforuvuwoze.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 5352 bytes
SHA-256: 472b028166ef74c76269b27afeb263cccb397fedb2fdb1c1f9905b220e10c170
font_01_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 11176 bytes
SHA-256: d0f9b309a86dde11335cda4b618180e6176df8534672fbe3dd494becb7320327

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