Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e6778940acc6bb…

MALICIOUS

PDF

82.2 KB Created: 2021-03-09 07:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1fdb15c6ebdd71bffb55312257bb74 SHA-1: e41a5bd1a4fdc3eb4a94086fe5db9c09e598dd6a SHA-256: 85e6778940acc6bbfb92712229548040529bbfdfa323feb37787048520e33ee1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=ar+er+ir+verb+games
    • http://look-hotel.com/9466658191g2e1t.pdf
    • http://zefoxerufizogo.22web.org/what_does_menagerie_mean_in_the_bible.pdf
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/kojarudijorojufa.pdf
    • http://tryse.xyz/lolovazogekotof4zu2u.pdf
    • http://help-violation.com/31680745418dwxea.pdf
    • https://vewutuzukep.weebly.com/uploads/1/3/2/8/132815207/9953598.pdf
    • http://health-top.ru/hex_to_binary_worksheetuamcu.pdf
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/pakalawaw.pdf
    • https://tonofoku.weebly.com/uploads/1/3/4/0/134096462/fomula.pdf
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/sememubovuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94b713e8-6066-4d69-8fdc-90cc96faaeb0/53353615691.pdf
    • https://uploads.strikinglycdn.com/files/b6921e92-6f64-4023-adae-88eb2dcc1248/how_do_i_change_my_braun_thermoscan_from_f_to_c.pdf
    • https://uploads.strikinglycdn.com/files/f7eeb33e-a57a-4fc5-a0c3-5c34785cace1/is_the_original_mad_max_movie_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/a768fe0b-672b-450e-acf5-8b71b6e945e2/15824308091.pdf
    • https://uploads.strikinglycdn.com/files/e3c85dd3-17f8-4387-8285-669c37255b78/recaro_booster_seat_review.pdf
    • https://uploads.strikinglycdn.com/files/6a1a76c9-25cf-4891-8a35-0737c86d2fca/surufomivukupo.pdf
    • https://uploads.strikinglycdn.com/files/8d01900a-2223-4c0b-994f-e243acde60c0/tolafis.pdf
    • https://uploads.strikinglycdn.com/files/f73a8e62-e245-48bc-a7b6-1f89887eccd1/39948876868.pdf
    • https://uploads.strikinglycdn.com/files/3d72545c-32c4-405a-aa20-8f6dc16b37eb/what_rank_do_you_have_to_be_to_be_a_pilot_in_the_air_force.pdf
    • https://uploads.strikinglycdn.com/files/17603f76-dc8a-4c5e-8c77-c579efa0fb55/vulojiguwezuwovelu.pdf
    • http://bofurirekotiru.epizy.com/sketchup_layout_templates_free.pdf
    • http://sexikiti.epizy.com/tuvivesolisas.pdf
    • https://uploads.strikinglycdn.com/files/aab9a818-5089-48c8-9327-ad8e5fe5cc82/46564806365.pdf
    • https://uploads.strikinglycdn.com/files/7f315f9d-3327-42a5-8981-e8d060f86bff/what_was_the_little_albert_experiment.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a0.bin
ee95cf2975ab4f586c72d1bb795031b236c420584fd3d29be57a59ce79d9df60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 5160 bytes
font_01_sfnt_off00011521.bin
b2b18c614a1bfc7867e6cb9c9fe0e5b00a7e66cb9839367e19546b74aa070d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 11592 bytes

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