Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad3c10fa37d242…

MALICIOUS

PDF

76.5 KB Created: 2021-02-19 09:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 64396f7e58a3446ebe033c0dc3f20fe9 SHA-1: 45f7d208e210ac4e97cdef0396003a0bea4348e2 SHA-256: 40ad3c10fa37d2424a580073011bae8c43766283807e0c35c2afbff8c1e7490f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=super+bass+bluetooth+%252F+mini+tf+portable+speaker+-+full+metal'. The ML classifier and ClamAV also strongly indicate maliciousness, with ClamAV detecting it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

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
  • 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://yafferge.ru/strik?utm_term=super+bass+bluetooth+%252F+mini+tf+portable+speaker+-+full+metal In PDF document text
    • https://vuvumapidikam.weebly.com/uploads/1/3/4/6/134668868/jusojirajesono-xejoguwutif.pdfIn PDF document text
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/1c1ddf7e63.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/5378355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5fec4970d787b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381083/normal_5fc8380d7cf39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_5fd8e311d0036.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/711211.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/513dbc4549.pdfIn PDF document text
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/5801136.pdfIn PDF document text
    • https://ledunadexaw.weebly.com/uploads/1/3/0/7/130775166/nunojo_zabumetovetefig_ralelufepizani.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/sumesawoxajew/93536314610.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/suxof.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/11811330774.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/concatenate_fields_salesforce_report.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/21092597763.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/ruzij.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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 5516 bytes
SHA-256: 81c7dd7e57c8daf2d60e05c1d538db17882ab7e0bff33e1c896d52e9706ee21b
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 11116 bytes
SHA-256: da5859b71c7acee51bb764339f4ded0d030ea357a93e5f27d8d8499f97fac2a6

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