Malicious PDF — malware analysis report

Static analysis result for SHA-256 508a02fb97ac68f5…

MALICIOUS

PDF

69.9 KB Created: 2021-01-20 11:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 04a9a636104c7e63d9199af953694050 SHA-1: a7013bd5ee635e627eaa460d2eed45378f4786a2 SHA-256: 508a02fb97ac68f5405074021353248ed7eca0675db2f31fc2e1d06662ee338b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The document body, though heavily obfuscated, suggests a lure related to 'human organ systems worksheet'. The presence of multiple external URIs and a high ML classifier score strongly suggest malicious intent, likely for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://trafftec.ru/123?utm_term=human+organ+systems+worksheet PDF link annotation
    • https://cdn.sqhk.co/salobosemiv/O26hfuA/45885013123.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jiQhejh/movie_director_simulator_mod_apk.pdfIn PDF document text
    • https://site-1192107.mozfiles.com/files/1192107/somibuzujemazufen.pdfIn PDF document text
    • https://loribipusav.weebly.com/uploads/1/3/1/3/131379532/xunuremevujuv-xemakuvuxoxoxiw-murulosif.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/divaferirol-witujijovovep-ribukozerilafo-xupekovemed.pdfIn PDF document text
    • https://site-1175392.mozfiles.com/files/1175392/eye_color_change_surgery_cost.pdfIn PDF document text
    • https://site-1168049.mozfiles.com/files/1168049/28141138034.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/eytf5hf/xivususabesag.pdfIn PDF document text
    • https://site-1201147.mozfiles.com/files/1201147/edmodo_free_for_windows_10.pdfIn PDF document text
    • https://site-1183516.mozfiles.com/files/1183516/lyrics_say_it_ain_t_so_remix_weezer.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/LtjghjB/how_to_play_perfect_on_piano_easy_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/jjBgjic/outdoor_rock_climbing_gym_near_me.pdfIn PDF document text
    • http://zajawezexefijuk.22web.org/35133982154.pdfIn PDF document text
    • https://sinemitivivofa.weebly.com/uploads/1/3/0/7/130740142/todexa_dimazege_zurar.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/xuxedavisisolivemebi.pdfIn PDF document text
    • http://lokogosomezik.iblogger.org/vertical_analysis_balance_sheet_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxumev.epizy.com/bigo_live_diamond_apk.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 5284 bytes
SHA-256: bd01763722b4ae3da7434faa8fd738ecd0dda597b4dfc9abb85efaf9789e0088
font_01_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 10696 bytes
SHA-256: 103087f4d51e2e3281266be2bde96c893a9d44b0c9b8efbd3824124dbbe0da96

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