Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7be56248a689c27…

MALICIOUS

PDF

81.9 KB Created: 2021-04-04 05:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ee91317ef980782c6b487142975e352b SHA-1: 135423cb2d041d70738d8c41f1ac2cf8c18f9edc SHA-256: f7be56248a689c271bf226240b2dcdc305d196a9b032feea8b055aede685713f
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-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://crophysi.ru/award?keyword=momordica+charantia+chemical+constituents+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5ffb0d4809326.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/ggsjdhh/21709070646.pdfIn PDF document text
    • http://on-arenas.com/sears_tools_made_in_usaksgp2.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/hhbBezC/mipomet.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/wIjgdKO/sonic_adventure_2_chao_egg_colors.pdfIn PDF document text
    • http://trudogoliya.online/craftsman_20_volt_lithium_ion_charger78v2m.pdfIn PDF document text
    • https://cdn.sqhk.co/selodiro/RjeuQDz/wimeloviju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_605598f2aad65.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/14320918244.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/6iigcet/the_new_fight_night_game.pdfIn PDF document text
    • http://fitokaps.xyz/wanobotodolipaporenejlr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4a2cab65-fc5f-48db-bef9-cf75bf7e2fbc/3m_scotchcal_vinyl_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ce2d57-10c7-4d43-8e83-58c7e45a2c8b/limowuzazijupebijow.pdfIn PDF document text
    • http://rugefar.myartsonline.com/quran_pak_surah_kahf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796acb80-c8e8-40b8-bb85-d4a03b248dda/38368210112.pdfIn PDF document text
    • http://fifabal.epizy.com/how_to_make_homemade_wine_from_muscadine_grapes.pdfIn PDF document text
    • http://lewuxiboru.epizy.com/is_marla_maples_in_a_relationship.pdfIn PDF document text
    • http://zumaborelap.rf.gd/al_mulk_full.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 5280 bytes
SHA-256: 219b7d5e368941c10868f5aee5eb41283749ccb47fd979641fb39e66c65ccf03
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 10744 bytes
SHA-256: a43b97c86316b60834888c3200ecad9f73eae5a7fb89d997e7923a9b433e7e02
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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