Malicious PDF — malware analysis report

Static analysis result for SHA-256 f323313a48d40a0e…

MALICIOUS

PDF

134.4 KB Created: 2021-03-16 04:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4bb479b145f23a7a0f9e1ba499895c5d SHA-1: 27f71e08c050d1c1a9e04fe1b3119bad3eb6800f SHA-256: f323313a48d40a0e3e99a85ca8176f14a263512cf662181d79de60f5b03bb0bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary external links is to 'https://soxebez.ru/award?keyword=benzodiazepinas+farmacologia+pdf', suggesting a phishing or content-farming lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded links and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://soxebez.ru/award?keyword=benzodiazepinas+farmacologia+pdf PDF link annotation
    • http://rinuzaje.iblogger.org/gamuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wezojepodi.rf.gd/jepawiwezesufodisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54827389-a75b-4916-b947-f05df38964d3/71779007391.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/40710268263.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/how_to_use_google_maps_on_iphone_6.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/6317750468.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/nexovekobovifolufuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a6f0df-f364-431f-8d5c-0ae7fc77fa18/is_monday_project_management_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/biography_reading_comprehension_worksheets.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_3b008eeabff649c79e801301f1af5900.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_0b906ccd6a8d4e61b376ce27e0d27ef2.pdf?index=trueIn PDF document text
    • http://vozuxekeve.rf.gd/bupuwesuxadavana.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_389329e1e48b4c778b575d05de72815b.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_431557b474e04c38bf16729746fe6909.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_4ef20186bdae49f291032422d09e97bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/33110379038.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/jonezejokekofitekabanazo.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_6b54cbdbe3a44313a34ee18eb87f6a11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57173fa-9758-4846-b4ed-be8e90f20489/kavikoruwidujejafunij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99f21a1-0db3-4834-8780-56e28c33c12c/fepemumeninezo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/diabetes_mellitus_diagnosis_nice_guidelines.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_off0001cc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC01 5572 bytes
SHA-256: f28c561f6089067e11d7b652d19779a861509523ccf230285c81f45e630fad02
font_01_sfnt_off0001def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEF1 13724 bytes
SHA-256: 6d83689f2f757f0a9793892fa1d26a5387fdcd75b9b08b76dcabe44cb839734a

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