Malicious PDF — malware analysis report

Static analysis result for SHA-256 856eb5a906ee70d4…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 14:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a44d3380f7f3a0587914e546ac943ef3 SHA-1: b71765bbd9d205912b90eeeace033168ca795b26 SHA-256: 856eb5a906ee70d49f1d066599f871dafe4b90dc80916295f082351af553e87f
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://xajibur.ru/wix?keyword=linksys+ea6500+manual+espa%25C3%25B1ol PDF link annotation
    • http://vanlit.ru/attack_on_titan_manga_volumes_englishc1z84.pdfIn PDF document text
    • http://xotiluzop.22web.org/handbook_spatial_statistics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_603b7a1ede6fb.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_600362e503a72.pdfIn PDF document text
    • http://vashastrahovka24.ru/hoover_steam_express_handheld_steam_cleaner_how_to_use3qk38.pdfIn PDF document text
    • http://copyrights-notices-helps.com/john_deere_190c_belt_routing2gyak.pdfIn PDF document text
    • http://topvideo.design/tom_clancy_books_without_jack_ryan_jr_seriesftoql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389601/normal_5ff617c48ad07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_6000158967d24.pdfIn PDF document text
    • http://creamwalls.space/javesijmt6uh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_60041bb608dcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damesudozur.epizy.com/catholic_prayer_cards_wholesale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6878cc-eea0-48ec-b051-696d0a733044/bopezodewovutubox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48311004-a865-427b-8325-eaf6073f19c2/where_can_i_buy_sports_illustrated_swimsuit_edition_2020.pdfIn PDF document text
    • http://rozofamano.epizy.com/student_profile_page_template_bootstrap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa7b760-f383-4496-9a31-746caab450f8/learn_how_to_read_korean_in_15_minutes.pdfIn PDF document text
    • http://kudugumokob.epizy.com/66574915758.pdfIn PDF document text
    • http://gilebufamefaf.rf.gd/28359574615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460c2486-f1de-4f4d-844f-1c24c67e7feb/special_relativity_postulates_explained.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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5608 bytes
SHA-256: d55799cab1a381f5bbcb955046198ea150870fcd8a84a61f5b486bb7c027142c
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 11600 bytes
SHA-256: 3bd451d09a13d415216b5b653d9eb2ba0332e4fc65552618944db9fbc0fbb5e6

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