Malicious PDF — malware analysis report

Static analysis result for SHA-256 241e25d7178aae93…

MALICIOUS

PDF

77.0 KB Created: 2020-12-27 03:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 32f4467d24a12753cd55fde3925c697a SHA-1: 679b63dd1bb8138d99a2235d7085b7cbc60070c1 SHA-256: 241e25d7178aae939da78d03b7b7c587f7d45e283196774b2ae3cb9615196566
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of many external links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/aws?utm_term=omegle+tv+ban+kald%25C4%25B1rma+android In PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/g7rEhch/lodutejovobolu.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/P8iihcp/siwojusinus.pdfIn PDF document text
    • https://tototatinup.weebly.com/uploads/1/3/4/3/134332383/sumewi.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/RKbjrm9/spotlight_room_escape_hope_math.pdfIn PDF document text
    • https://cdn.sqhk.co/buweworipoza/lkbn3ji/vokanamomezel.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/lewixax-difisevar.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/taxepuso-vakujakarox-vusan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/liwafo/midudexagepasaxujes.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/gusuvaxufolo.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/esquema_de_vacunacion_cuba.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/operating_manual_for_spaceship_earth.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_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 5080 bytes
SHA-256: 97e33973d0e2115b3fc8150795c67501c3768b2617bc7f7804c334542c08c9ab
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 12576 bytes
SHA-256: 58a86a78a9f713bf8466844d1fce7bb41fa5e3dc080177777dfeaba7f6d8c84c
font_02_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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