Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd267d2c3cb8392c…

MALICIOUS

PDF

85.3 KB Created: 2021-03-18 07:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 37727f0cfa9d37f331efb34b8fb47684 SHA-1: c9246df4814028de4f65b3684aa19a3f47658cb7 SHA-256: dd267d2c3cb8392cdf3d0e515474019311f6601d51c4bf3d9f4e24f0712495b1
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to a link farm designed to host SEO-optimized content. A critical heuristic identified a link farm with 30 external PDF links, and another high-severity heuristic flagged an image lure linking to an SEO redirector. The primary malicious URL identified is vilenefex.ru, which appears to be a redirector for potentially malicious downloads. While no scripts were explicitly extracted, the PDF structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://vilenefex.ru/wix?keyword=geometry+apk+pro PDF link annotation
    • http://rupazaduxil.mywebcommunity.org/fire_and_ice_jewelry_candles.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/educational_research_quantitative_qualitative_and_mixed_approaches_sixth_edition.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/mirireri.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/e94f9b93e7.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/jdxG6hc/tetris_ultimate_3ds_metacritic.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/0318a.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/jcJjbfR/bubble_shooting_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/auNhjKy/through_the_ages_expansion_cards.pdfIn PDF document text
    • https://fuzurisef.weebly.com/uploads/1/3/4/3/134369427/voves.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/pafebolixegutas.pdfIn PDF document text
    • https://cdn.sqhk.co/dopinaku/UYHrhjD/missing_toddler_found_dead.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/hgqOjfM/monster_truck_racing_uk_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/muxepofuselikaterutamo.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/chet_atkins_windy_and_warm_lesson.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/positive_discipline_jane_nelsen_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/a_level_maths_revision_worksheets.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/insinkerator_disposal_switch.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/what_mecha_anime_should_i_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/full_and_final_settlement_agreement_template_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/2003_yamaha_r6_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/zugali.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/how_to_find_housing_in_san_francisco.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/patotus.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 4952 bytes
SHA-256: 701ecf9172325e5066141d1056b358a2ab6bd7ebedcd5276700f5c0eff7fde1c
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 11076 bytes
SHA-256: 54a875bdcbec2533fabe18c36fc87c00b6834bc7c8e5a59076c92640f13b8a98
font_02_sfnt_off000130f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 16680 bytes
SHA-256: 75b7ee48794eade67332071a0fc48332790b6d824c5a502c0389a537f98802ef

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