Malicious PDF — malware analysis report

Static analysis result for SHA-256 f081da8da2a7dab4…

MALICIOUS

PDF

74.3 KB Created: 2021-01-17 05:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 901ea02895507d611a82450e29c93e7b SHA-1: d9671c0a008e19c7251cedcf4fdd0bf305bf84cb SHA-256: f081da8da2a7dab484d4f5a390b47facd310460c131c89f325d427977353c8ba
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'gettraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, one of which is 's3.amazonaws.com/bodajaku/official_guide_toefl.pdf'. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The document body is heavily obfuscated and unreadable, preventing analysis of its direct content, but the embedded links and heuristic firings strongly suggest a phishing or malicious redirection attempt.

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://gettraff.ru/123?utm_term=badger+100+1+manual In PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/doreriduvuzep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_5fccdd777cedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fa66c17d8f30.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/xenesod-lidura-merujunejujo.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/7339448.pdfIn PDF document text
    • https://site-1172046.mozfiles.com/files/1172046/pubawexijemegubasidutisub.pdfIn PDF document text
    • https://fijuwokokaku.weebly.com/uploads/1/3/4/3/134382009/55df81c9b8.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/bodajaku/official_guide_toefl.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/87376282931.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/austin_isd_school_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/surokagobofujipogasugija.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/97307156035.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_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 5212 bytes
SHA-256: 41ad2d7b0bfe57d876f635ac7871d8e7f2f5b16f729ae93390765d9e9b89f19b
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10984 bytes
SHA-256: 035aa35220a3554b6ad29764b17b3bbdbbb1294f4273431532284d6ff066c899

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