Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad326412bdadd230…

MALICIOUS

PDF

89.3 KB Created: 2021-04-01 20:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1520bbd030d665aa8a16c8d0b17933cd SHA-1: 2d8a06bc94f3b83f4c3d44389b632592f300a99a SHA-256: ad326412bdadd2302bcee9b17221d7ab8eda3a5320a2ede89c3d8f58362337c4
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to known malicious redirector infrastructure at 'https://crophysi.ru/strik?utm_term=english+grammar+for+students+of+french+jacqueline+morton'. The presence of a link farm on disposable hosting further suggests a phishing or malware distribution scheme. No scripts were extracted, but the document's structure and embedded links are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=english+grammar+for+students+of+french+jacqueline+morton In PDF document text
    • http://joritirumag.mypressonline.com/fitodixipekiximiworetu.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/76a2f1d1df206.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/girl_boss_baby_party_decorations.pdfIn PDF document text
    • http://matcobzor.ru/how_to_turn_on_hayward_heaterm1l5n.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/3288559.pdfIn PDF document text
    • https://cdn.sqhk.co/fedijadika/aehbhjg/cityscape_neon_city.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/centralisation_and_decentralisation_in_public_administration.pdfIn PDF document text
    • https://kavikazu.weebly.com/uploads/1/3/5/3/135392310/dupot.pdfIn PDF document text
    • http://allfreebets.ru/24537946334eo5gx.pdfIn PDF document text
    • http://igonlinesupport.com/95310646415mqm4c.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/hhib3XY/73631626604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/85486888595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d09b9d9-694a-4af7-b479-d3e8b026569d/what_is_child_focused_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/timex_cr2016_cell_wr_30m_stainless_steel_back_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afc52cc-ae86-48e0-ba4e-943986ddbee2/27818290146.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/jemaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d211214b-1161-4ae6-a558-6a128d8a2e76/principles_of_computer_security_4th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ed93c0-af6e-476e-a340-cc56884c1edb/smart_personal_development_goal_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6460bf34-08ff-494e-97a7-3742c08406a7/98562485039.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/dirt_devil_power_express_lite_pet_3-in-1.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 3240 bytes
SHA-256: 34f761aca10830f944b5c15ce4d46ed1c640ad64a6fdb2cdb54de11e0ccd2072
font_01_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 5596 bytes
SHA-256: fab8f8abdfd866672b4b77a2337eec775f7a5a70879f94e351d47396f800ff6d
font_02_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 1820 bytes
SHA-256: 1e7ecf19709c443715ab984a1fc35a88cad5b910c55d8d075759a054211efd7d
font_03_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 11112 bytes
SHA-256: a83419fe6781f816828e8085a4fde8419c5c7bae8be5cb2d393bd23f4cecbf44
font_04_sfnt_off00014085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 16396 bytes
SHA-256: 073945280661ae3a6fecbb563a682def5eb268ae0622d394d5dce3fc9c0b0951

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