Malicious PDF — malware analysis report

Static analysis result for SHA-256 8817538d141ade07…

MALICIOUS

PDF

76.7 KB Created: 2021-03-25 03:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 103581471c3fe95e94b0e7f3bc07b844 SHA-1: b91d8a62a34aad57ab5e2ed918990bb7b5a2e90b SHA-256: 8817538d141ade0700007f24ff6dd0b6034ff1140a15c3e2334c73e8f5099621
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary suspicious URL, 'https://druttle.ru/award?keyword=les+adjectifs+d%25C3%25A9monstratifs+et+possessifs+pdf', is identified as a redirector. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/award?keyword=les+adjectifs+d%25C3%25A9monstratifs+et+possessifs+pdf PDF link annotation
    • https://cdn.sqhk.co/nefakovuwot/dLEWihR/sikoxis.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/hhKydih/grass_cutter_hire_near_me.pdfIn PDF document text
    • http://korixoludofuguk.scienceontheweb.net/pulipivaluzosime.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/gdjgRjf/92068419911.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/PRNigje/flight_club_sneakers_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/ihnvXgg/samsung_s9_alphabetize_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/hj0C5gg/ardyss_body_magic_size_guide.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/stages_of_language_acquisition.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/ecRCgie/apple_music_family_plan_vs_spotify.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/4fc6925f-a7ac-43e5-84d5-03935f4b3e2b/91504636008.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_8b321f9b85d34fd6905bd75c3450cf5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79831d9-df74-46f5-88e0-67886c9f8d40/are_we_equal_before_the_law.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_7cced007faa345c7a02e84cb4a8c367b.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_53fc0187368e42638016adea92b2ae60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfb7d15-24f5-4f0b-8392-210bd14284b2/subdivision_meaning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f5838a-fb12-4078-a802-77637afa54b8/what_does_a_17_year_old_need_to_get_a_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b35a6e-fa02-4329-bb4e-c956a8c7de13/que_funcion_cumple_cada_organo_del_sistema_endocrino.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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5428 bytes
SHA-256: cfccdac7be22edf24b94f489c2b8d92e395fc3009be6276fa64cebbd8337a984
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 13040 bytes
SHA-256: e651263a5cbc6f19675c16e84a825df3a1859b23ed0eb5a4d92b31c0092f809c

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