Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f28e7d6ca0dfe41…

MALICIOUS

PDF

79.7 KB Created: 2021-05-18 00:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dac8ec239cba90de1ea919d47c76d7d1 SHA-1: ec65bcf9f0f0a8f6ea31f9b86914d019b6b80b81 SHA-256: 3f28e7d6ca0dfe41b4cbd1ddb6178f545b8c487da8a1e3854cce284fd892a5df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or redirection scheme, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content, likely hosted on domains such as maypoin.ru or rojikejasixut.weebly.com.

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://maypoin.ru/strik?utm_term=pokemon+sun+and+moon+mod+apk+android+1 PDF link annotation
    • https://rojikejasixut.weebly.com/uploads/1/3/2/6/132682083/kenitu-tavar-taxew-joveg.pdfIn PDF document text
    • https://riledamulobav.weebly.com/uploads/1/3/0/9/130969772/1205f981.pdfIn PDF document text
    • https://xiworibamenu.weebly.com/uploads/1/3/4/7/134728691/5549319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_6002fc2329ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_601da5f989596.pdfIn PDF document text
    • https://kaxupigokib.weebly.com/uploads/1/3/5/3/135324743/7059845.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/1062867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomepexajusopa.epizy.com/vatican_guided_tours_skip_the_line.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/vawoxaresixerexozuwot.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/how_do_you_reset_the_oil_life_on_a_2008_honda_civic.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/nukiferusidimajo.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/sumixinejenimuvejifunuxuk.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/wosogotopamagepofamipatij.pdfIn PDF document text
    • http://kazivaf.epizy.com/how_much_do_hot_springs_hot_tubs_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/hd_wallpaper_for_android_phone_anime.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/727310766.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/30019205579.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/functional_block_diagram_of_8085_microprocessor.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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5192 bytes
SHA-256: 113bef58abf7be36da5c30b50dbfb7ca07e926a4de7708c81c2ac3f70d15f1e8
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 16772 bytes
SHA-256: 0b4ff2c3178b0e44827fc1bdb3607c8a030e4a4487401b8fc973cfbd355651b2

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