Malicious PDF — malware analysis report

Static analysis result for SHA-256 64253b360edb1924…

MALICIOUS

PDF

67.0 KB Created: 2021-02-21 16:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 58d1951552635d26f8108389e307a140 SHA-1: 7af89940e753abbfd5de886a152c8800f425d92e SHA-256: 64253b360edb192413b5522d69f2a0efb991758514f8ea8e0fcb63deed1ba0db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=singer+athena+2000+manual PDF link annotation
    • http://airbin.top/72689544583brue6.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/euZGhdw/movie_box_office_full_hd_movies_free.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/96772991362.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/constitution_powers_of_congress_word_search_answers.pdfIn PDF document text
    • http://azakalaza5.xyz/british_sports_car_informally_crosswordv9o6c.pdfIn PDF document text
    • http://muziwavesos.iblogger.org/53294715657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffe498c64a43.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ujfDib5/checkers_trading_hours_polokwane.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/zAAlhiA/filters_for_instagram_live.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/yCyiahg/90606793560.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/zufojadibi/72502950039.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/14560559270.pdfIn PDF document text
    • http://mewuxizu.rf.gd/la_revolucion_epigenetica_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/kagetokejerijikejazupi.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/56660352545.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_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 5300 bytes
SHA-256: 92dc42b4db4fd530e84cfa1ba17bf320ff15ec3483a161fd4f8a31c855d6bfaf
font_01_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 10772 bytes
SHA-256: ca442646ae2ad272ddee4ec7fe42b32d02a283953e295b988a806428ab301ca0

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