Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df2536505d6910f…

MALICIOUS

PDF

68.8 KB Created: 2021-02-10 22:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dea490ff411398a11aff954015dda7bf SHA-1: d2c525045fa369c40717d735fbf93be8962ce865 SHA-256: 7df2536505d6910fbb63f2ea80b8793491094a496e3865173eff7d22993da880
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a mass external PDF link farm. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, aligning with phishing or SEO spam tactics.

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://druttle.ru/aws?utm_term=deborah+de+luca+essential+mix PDF link annotation
    • https://pifisurap.weebly.com/uploads/1/3/4/1/134108900/ranejowin.pdfIn PDF document text
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/pitojebifajomaf-dalixedu-masotogag.pdfIn PDF document text
    • http://mail-autoscout24.net/226584104033qp4m.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/1284047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_6022b0e971559.pdfIn PDF document text
    • https://befibexa.weebly.com/uploads/1/3/0/9/130969759/kolalegil.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/eec9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467560/normal_5ff911dac5431.pdfIn PDF document text
    • https://rivakevalitute.weebly.com/uploads/1/3/0/8/130813818/6f1561292.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/wipotegadodorek/lamip.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/free_powerpoint_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/babbu_maan_song_mr_punjab.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/59884703792.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/jopiwefotew.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/9013996646.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/punjabi_breakup_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/stock_inventory_free_template_excel.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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 5388 bytes
SHA-256: 232fba28cc9d8a38793db78f8a883218b9f3e6b73f93d21dffc9caacd51b0f56
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10604 bytes
SHA-256: 84b45e0f291d01415709838e726a3292f7844e58bf498c5dc929a40582756d53

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