Malicious PDF — malware analysis report

Static analysis result for SHA-256 3362d49f76234aa9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-02 21:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 10722237c4383891fe45faac818c902e SHA-1: 602069d5a66813d4f6a47469cf965734453a2190 SHA-256: 3362d49f76234aa9fcb3838670542744d083296e05945e142e4710aaefe9f007
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution campaign, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://vilenefex.ru/123?utm_term=present+perfect+tense+worksheet+7th+grade PDF link annotation
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/baviduvaxijuw-zusazebunewo-feranejigi-xebuwopoki.pdfIn PDF document text
    • https://midezotadodagof.weebly.com/uploads/1/3/5/3/135326840/1472734.pdfIn PDF document text
    • https://xemivonosinuvi.weebly.com/uploads/1/3/5/3/135314407/fc7661207993.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/ca8912.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/47d65ed076c72d4.pdfIn PDF document text
    • https://jasugupaxawuz.weebly.com/uploads/1/3/0/7/130740610/dimalomo.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/8213781.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/kolilonamasepag.pdfIn PDF document text
    • https://ninafaguri.weebly.com/uploads/1/3/4/5/134592808/maxopezeno-dekubigomit.pdfIn PDF document text
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/kikoloxatoxo.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/a9f2d97f7.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/3964683.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/benubapopikaj/81142031837.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/samsung_file_manager_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/nasefinizoxetubuzuwoboviz.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/wifigajutidovavesodeleti.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/35293939326.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5624 bytes
SHA-256: ba2685ca8fe31b9ba4161ac80d98eae455b574477db0b8bd23108e9b77820281
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10212 bytes
SHA-256: 2fc054818b77f4d2f7133226d53b3d8875b6658bd77eea2b30d83e0d34063ae2

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