Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b97d0c65388cfb…

MALICIOUS

PDF

77.6 KB Created: 2021-04-26 09:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aaadceefcaf606b25b6cbea41caaf5b5 SHA-1: d93effbc5e4be01d0435056993b5b114bc6dc1ca SHA-256: 87b97d0c65388cfbf5222ddbef804f8526fe331d408091163f66ae648fa998d6
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 0.9995

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://lozipotod.ru/strik?utm_term=how+to+reprogram+a+chamberlain+clicker+garage+door+opener PDF link annotation
    • https://cdn.sqhk.co/rawatajizefu/a7icMCP/45294428742.pdfIn PDF document text
    • http://zeropium.com/7902891384580l2i.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/OjimYjg/17144135223.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/vijiiis/xoxowatagarar.pdfIn PDF document text
    • http://tihefers.online/nulegesositotulumutibera1hgma.pdfIn PDF document text
    • http://italywow.space/how_to_write_a_specific_purpose_statement_for_an_informative_speechy7qsx.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://xelowonol.scienceontheweb.net/70612453700.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/dJ25ido/tarujuj.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/adjectives_with_negative_prefixes_exercises.pdfIn PDF document text
    • http://covid-19online.site/356892751988sptt.pdfIn PDF document text
    • http://shtancircul.site/maromatejaxinubuwqa6u.pdfIn PDF document text
    • http://uorott.com/pazumejojuvigavipsbcgl.pdfIn PDF document text
    • http://naturebiolog.space/tutojinefezidegufq6wl0.pdfIn PDF document text
    • http://luminar3-download.xyz/why_does_no_one_like_cats_the_movietg7hi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99232dfc-d376-462b-9194-60631438c155/daily_language_review_grade_3_evan_moor.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/77339927003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58af045-99ab-4465-84cb-ce964cc63cda/14871695341.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/38652412504.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/zapel.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/xivatarejogeremev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee56e1e-cdd1-4abc-b25e-f7161983acb2/smoothie_recipes_with_frozen_fruit_and_no_yogurt.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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5568 bytes
SHA-256: db6c303468ee764058da54294bb7b7aba5e8d3dcb1f34f26d641bec8d82283c0
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10848 bytes
SHA-256: b1984f664444ca53f4ac7eb75df6cbe7f51ce91a054bb2406ac6e1a07e7cada4

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