Malicious PDF — malware analysis report

Static analysis result for SHA-256 21402e5a7087865d…

MALICIOUS

PDF

76.8 KB Created: 2020-12-21 00:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 07980646d5c2803e073bc966ff2f7449 SHA-1: 736c9c6bedfe05ecbc1ffc45aa79c7be38f75e09 SHA-256: 21402e5a7087865d2ebd6121c42727e81dae5a65efc79486ea3a32594a22fc68
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, 'https://traffnew.ru/strik?utm_term=risen+heroes+idle+rpg+mod+apk', suggests a lure related to a game mod, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://traffnew.ru/strik?utm_term=risen+heroes+idle+rpg+mod+apk PDF link annotation
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/ccc971c.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/kalawufowidifozazare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc667f3bf71053ccb3540b0/t/5fc7fefa2b9a131312773e8c/1606942458504/jungle_run_temple_escape_room.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/busotubemixuruzowug.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/25762321367.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/mejores_audifonos_bluetooth_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/why_is_natural_selection_a_non_random_process.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e8305687f52b6b812c21/t/5fc19e42f8cdb769c620a882/1606524484397/ducky_from_land_before_time_death.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc191a61452f90b7fea0e1e/t/5fcd49636f0099009e7200a5/1607289187855/durak_online_hack_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10dd588c99b6d37a7fa85/t/5fc54636bc819f1cf485f708/1606764088349/rojolu.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/23004636739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e08973-e406-4860-b146-e98cbd76239d/6407098856.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64e9b2e537a05ef2de0c9/t/5fd223d07cf94534dc64511c/1607607249023/gas_station_2_highway_service_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/57789839125.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc363b5c6d964583631f5aa/t/5fcaf91ba51c5a1401a10ad8/1607137563450/bemoduzu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000106c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106C8 19228 bytes
SHA-256: 0f9b6121545ca86c29670a51bfbbef94fcb5d11c9398152c69389fbc7fdcd745
font_00_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 5444 bytes
SHA-256: 681fb0eb50be232bebda110ffbdadffb067781dadd6acfdf63d7fed9d3e1180c
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10532 bytes
SHA-256: fbf54eb676f04c0e786198e1ad17e7b452f24175c511ff7a941ef34088b622b9

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