Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed44ac0a005df6c2…

MALICIOUS

PDF

74.1 KB Created: 2021-02-05 12:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 03a01901befe9a2380ff35dad2fbe5eb SHA-1: 525a20ae23201021bdf19a8a331b98ebde79268b SHA-256: ed44ac0a005df6c25eaa2f3ed20d9b3377308b3273d48363b222da8e2894329f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, contains text related to 'Bcbs mammogram guidelines', suggesting a lure to trick users into visiting malicious or spam-related websites. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for SEO spam or phishing.

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://baarspo.ru/aws?utm_term=bcbs+mammogram+guidelines PDF link annotation
    • https://cdn.sqhk.co/fujalapevame/hi0Ushf/2891282404.pdfIn PDF document text
    • http://datab.vip/strikers_1945_ww_best_planetedpl.pdfIn PDF document text
    • http://idealica-uficiale.website/jeopardy_powerpoint_themebboh2.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/cake_recipes_from_scratch_red_velvetdbeyv.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/kumozuwutebizul.pdfIn PDF document text
    • http://kindraretterath.com/912614705963y685.pdfIn PDF document text
    • http://datingdate.site/the_game_pickup_artist8rvut.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/portfolio_download_freekzcy6.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/h7KLCF2/aarp_crossword_answers.pdfIn PDF document text
    • http://copyrighthelpcentral.com/35302839504xkd4f.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/d9FBjaT/94860935588.pdfIn PDF document text
    • http://honey-love.ru/kajibiwaxakowunafilo9k6b5.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/kakef/wimidaloxusiku.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/49343614475.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/engineering_grid_paper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/backseat_driver_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/net_speed_meter_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/minecraft_forge_mods_1._12_2.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/rscit_answer_key_22_april_2018.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5448 bytes
SHA-256: c2f905f5ac94d0c4e20ded0e8621afa27bd4b6c8377b05f94e5ca960e984f0b8
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10296 bytes
SHA-256: ff5cde02ce657d634ed479328290216d16a8c6840dfc8efedc171029a64326fd

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