Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef093bc81c9a6b3…

MALICIOUS

PDF

66.4 KB Created: 2020-11-26 05:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e36697a49c1371bfd14fd747604256da SHA-1: a438fadb7f5e65259a8eed4e111449e8e6b81d4e SHA-256: fef093bc81c9a6b30d7381d527540bd21a8b65b5b6f1ebe5023887b3beb7e02f
214 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The ML classifier and ClamAV also flagged this file as malicious, specifically identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://traffine.ru/123?utm_term=west+education+campus+reviews In PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/11b64b756dcb2.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/jibamu_xekime_gediju.pdfIn PDF document text
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/d007d4cca70.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/d947dd1ef425f.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/tupudelo-pesilep-zodefifukabupa-naxigo.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/0504b6.pdfIn PDF document text
    • https://fimagokuzite.weebly.com/uploads/1/3/4/6/134681622/rimuz.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/dalava/tukomewuvinefugatomof.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/1629894598.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/body_plan_of_arthropods.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/sevudakewemejumote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111bddd9-abfc-4c4e-8c3e-5cba6f023788/yeni_trk_edebiyat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e4cece-1939-4903-b0af-4bffbc0e2372/ginufuteji.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/67780074723.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/68542172011.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/medeluboboxuwifupiremoxi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 5352 bytes
SHA-256: 8db554677883720259073e541a3d7ad2dc2056613da925ab440aaf1f116c9c5b
font_01_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 1852 bytes
SHA-256: 30d16f7417f0add8d0285b648bbaf00e913f8a8b98029eef0ba4a775d80cd2e5
font_02_sfnt_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 11720 bytes
SHA-256: 5a825d8f18cbbc9ea22acf9cc53a3e7a84f70f9d7142c12e0a367b4bd07c36bb

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