Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db4142697a21cec…

MALICIOUS

PDF

79.1 KB Created: 2021-01-03 14:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e3035456ffad99ee8d4eaa3661b6ad58 SHA-1: 7091c4efe10bc94d5be43ff6ffe1bb6c668855ec SHA-256: 1db4142697a21cec878b2b00df5e0d3579f50ba700e67fb33292f1dedaf6d9aa
214 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to redirector infrastructure or are part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the primary purpose is to direct users to potentially malicious or unwanted content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as phishing or a trojan.

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://cctraff.ru/aws?utm_term=what+is+cash+flow+analysis+form+1084 In PDF document text
    • https://cdn.sqhk.co/remowiwa/0FjMU2j/video_status_song_new.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/468bbe83d03.pdfIn PDF document text
    • https://pabixiwirixe.weebly.com/uploads/1/3/1/0/131071256/bca6e1cf4d20.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/3538932.pdfIn PDF document text
    • https://mumifigade.weebly.com/uploads/1/3/4/3/134314269/6a0947b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fd115ac6604d.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/8056482.pdfIn PDF document text
    • https://buvijolijesikuv.weebly.com/uploads/1/3/4/6/134602818/0ab5521f292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5ff0ad211ce06.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/muvojugejoxip/papilas_circunvaladas_y_fungiformes.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/word_flowchart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/minecraft_avatar_ba_sing_se_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/71031872010.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/25_june_2019_weather_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 5804 bytes
SHA-256: af57e5e0f3d2d701266de2d9c210868ca09a44b1763e5fcf13561b0289109439
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 11568 bytes
SHA-256: 5f52ab1649fa74e6a41f96e125e101c9fd3f989237f3c2e15294e26c73f7f6f0
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb

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