Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ec5068d3be2fc…

MALICIOUS

PDF

74.8 KB Created: 2021-02-25 06:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 62f0b3b186d1aa175fc875a432bba0cf SHA-1: 723e96467367c8257b48665a9afbe8b6281fd9c8 SHA-256: a85ec5068d3be2fcddebb7acd54b37d400283ee493f27aef0b2cc23dbafcdafa
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many of which are to PDF files hosted on various platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites.

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://leonvi.ru/award?keyword=collagen+improve+skin+tone PDF link annotation
    • https://pilawero.weebly.com/uploads/1/3/4/0/134095891/gojimovepimomun.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/6253171.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/4152548124.pdfIn PDF document text
    • https://dojosijodutater.weebly.com/uploads/1/3/6/0/136050104/jiwixere-zuzikalop-geninubona-jozenig.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/aTT4fm2/train_time_sydney_to_newcastle.pdfIn PDF document text
    • https://vibofigejud.weebly.com/uploads/1/3/0/7/130740502/kadipegabunefaf.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/pizexopenaxu/jepivobezonefol.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/chilam_tere_lakho_ilam_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/sad_boy_cartoon_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/blank_sheet_music_word_document.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/vetanemikereganijiku.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/chaplin_smile_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/web_browser_with_manager_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/64709289736.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/android_studio_assets_folder_not_found.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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 5168 bytes
SHA-256: 795f6702a53bbff8f47c030f718eec356d32b001f6d28ece1c14d8b31d63246b
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 10196 bytes
SHA-256: 4a5f8327e27eb6d5d858504179ef24881cb509d8139abf7a5d5b1d56faad135e

Open this report in the interactive analyzer, or submit your own file for analysis.