Malicious PDF — malware analysis report

Static analysis result for SHA-256 a386213c6dcd6a24…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 12:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 54dd519f564abc79b7bce747f9e2441e SHA-1: 91d0f9b1e933cb8f51d9ea37ad793a0586f0afc4 SHA-256: a386213c6dcd6a24b6968ae321faa9fe28d7f6fd4f825d4cd674c5417c5dda53
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=klasifikasi+daun+binahong.+pdf In PDF document text
    • https://dulifemubal.weebly.com/uploads/1/3/1/3/131398350/aac586b27555a5.pdfIn PDF document text
    • https://natuxebifenukud.weebly.com/uploads/1/3/1/3/131378868/megerinibitavifufi.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/nefalojanirof-nowoposaw-bereb.pdfIn PDF document text
    • https://mosagalalevo.weebly.com/uploads/1/3/4/6/134668437/nivaxuwi_vijagezel.pdfIn PDF document text
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/fokasatepi.pdfIn PDF document text
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/bikuxesunulima.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/artificial_intelligence_by_rich_and_knight_full.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/vixojagobepajaminobeg.pdfIn PDF document text
    • https://duxosefexi.weebly.com/uploads/1/3/4/6/134605181/6911114.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/tolosawo.pdfIn PDF document text
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/gevutavududoma.pdfIn PDF document text
    • https://vetenejoxo.weebly.com/uploads/1/3/1/3/131379321/latonuwakubibutu.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/xovekolamoxe/automatic_flight_control_system_for_uav.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/asphalt_6_adrenaline_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/sufepexujabo.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/affinity_chromatography_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/java_apache_poi_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/devudutenavinulotoben.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/what_do_cups_symbolize.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/how_to_change_the_line_on_a_craftsman_weedwacker_25cc.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_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5412 bytes
SHA-256: f0db208d46294c05554f21bc5a0d7cf2cd3cee6d764053868e12c7d7721dda18
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10340 bytes
SHA-256: 5361aed621288dd026dbe4cbed8c3f6f09d7f0a5eb3c115e8d7e8c1f89115699

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