Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10d7c15a6ae51d7…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 19:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4093b19b8737485198603644c862c16e SHA-1: 5876e095deee153b8f25dabf9de1d693b5f56b0d SHA-256: a10d7c15a6ae51d74ef831c2fbcf5b935ef1db2854329bb889eaa957519625af
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and potentially acting as a link farm for phishing or malware distribution. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or credential harvesting attempt.

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 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://baarspo.ru/award?keyword=subliminal+how+your+unconscious+mind+rules+your+behavior+quotes PDF link annotation
    • http://bukipanugub.iblogger.org/mixels_games_free.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/2716337.pdfIn PDF document text
    • http://aarbuz.space/open_morrowind_android_mods23fth.pdfIn PDF document text
    • http://899themes-demo.ru/vewaledunuvapugaxagatufhk7b.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/43948d80a61.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/ab6828be07d93.pdfIn PDF document text
    • https://wafitaweligu.weebly.com/uploads/1/3/4/5/134587259/6931180.pdfIn PDF document text
    • https://cdn.sqhk.co/filajokajemu/YjgnLQT/retro_city_rampage_dx_wii_iso.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/jbagdgx/hot_rods_for_sale_asheville_nc.pdfIn PDF document text
    • http://bnl-jobs.com/82845924930qauas.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/somamere/veterinary_microbiology.pdfIn PDF document text
    • http://godawawisegi.epizy.com/tamanna_movie_1997.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/80281219328.pdfIn PDF document text
    • http://vofaxov.epizy.com/tovuwijofanefizepijalowi.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/crash_course_biogeochemical_cycles_worksheet_answers.pdfIn PDF document text
    • http://fejivexol.epizy.com/nixewizojubowivoki.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_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 5800 bytes
SHA-256: 51033fb2f7c49a8cbcb45046a9601c9dc27c0ed897bc46670d2673bbb95072f2
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 10392 bytes
SHA-256: 1140e497b0cac61401b708b4c247d5c8f5d686b4e624e8acfd48f029d090558f

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