Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c79efcd6148850…

MALICIOUS

PDF

84.0 KB Created: 2021-05-23 12:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb241d45b9bb3b3da2cd3a823c09b0a3 SHA-1: 6cbbf6ecbede6d41299af7702ad61e0c976d8481 SHA-256: 62c79efcd61488500fc2e940a7223f08450dae4dc397c7766f8442eb53c0b8a9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains (e.g., weebly.com) and are likely part of a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to generate traffic to these external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://vilenefex.ru/strik?utm_term=bonus+payout+letter+sample PDF link annotation
    • https://webuseki.weebly.com/uploads/1/3/2/8/132814302/b6455ac9e7b.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/vigedibirikibimadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ff4315d639a6.pdfIn PDF document text
    • https://zukazitorixum.weebly.com/uploads/1/3/4/7/134772558/damapati-jolab-mogimim-nofulomo.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/ec802308bf.pdfIn PDF document text
    • https://venofizemebesok.weebly.com/uploads/1/3/2/6/132681219/d44a32d5e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_6001c379d07b2.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/risunojesegig_fanalamunojumi_toteroge.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/jifozus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_601230fa0741d.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/febopa/annamalai_film_bgm_free.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/66290749259.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/braun_strowman_theme_song_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/vosemiboxuru.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/best_aimpoint_mounts.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/70190628323.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/what_are_the_steps_in_the_grief_process.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/30134080196.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/autodwg_to_dwg_converter_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/26337220149.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/83711371034.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/prepositions_exercises_for_class_10_cbse_with_answers.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_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 5116 bytes
SHA-256: 76c3e5a5c831167e77eca57224832bf411a88a9c9c253f3c403fd70eafe6e685
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 11332 bytes
SHA-256: 171811a1e7fad37933ecfbe38da8694c1afd337c2a34301cba915f856bff4313

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