Malicious PDF — malware analysis report

Static analysis result for SHA-256 344d397b7c5490dd…

MALICIOUS

PDF

75.4 KB Created: 2021-01-03 23:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9060a5a953ca937b99fa7ff5546392c0 SHA-1: 64782ba56d9ebd235714407f6a948965c516ba27 SHA-256: 344d397b7c5490dd2b334c550fd3b056eb9d6acebd54739e4cdc944017451ec1
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 SEO-optimized PDF documents hosted on various platforms. One critical heuristic identified a link to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://ggtraff.ru/wb?keyword=bubble%20wings%20growtopia In PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/tamosek-sokosaf-biwotodowoj-pizovas.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/hbXESA8/lelalapijeguj.pdfIn PDF document text
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/rogiwukokuzuv.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/papagogubu-kenukopifiton-kajiso.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/cDjbA2J/huawei_health_app_not_working_android.pdfIn PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/2847778.pdfIn PDF document text
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/1950663.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/Uyegdhc/birthday_wishlist_meme.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/gezetega/greers_ferry_lake_walleye_fishing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/introduction_to_math.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/vmware_vcenter_6._5_ovf.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/xosipeviwomilezopobefenuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/80239150110.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/kansas_medicaid_application.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/invacare_bariatric_bed_sheets.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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 5268 bytes
SHA-256: 6073dda7e381ebac50dcfe5798de7704ddc8313fdb8579a1f2f8b82d7b9e43cd
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 12032 bytes
SHA-256: afd674093952750fab695196d22c5a3f60a00dc44dcb329ac43c2cd7461b9804

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