Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7814d4d95f1e47…

MALICIOUS

PDF

95.5 KB Created: 2021-03-18 09:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d6077337c2587bac155451acc93b0da1 SHA-1: 56f10a6c14a4e8d9a80e554d4537228166c47387 SHA-256: de7814d4d95f1e4787b01e4abbe6a50f2ce296f9c825eef38963ccd58d576b69
186 Risk Score

Malware Insights

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

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 0.9988

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.
  • 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://leonvi.ru/wix?keyword=town+hall+10+farming+base+no+inferno+towers PDF link annotation
    • http://lestyprin.online/89798708982nfc0x.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/6ifhejd/dewujuwapixepanenus.pdfIn PDF document text
    • http://lifeit.pro/89676515108ols3y.pdfIn PDF document text
    • http://aazzzry.space/stress_strain_diagramdh55i.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwogoxozoxi/YjaUhhf/winking_owl_sweet_red_wine_calories.pdfIn PDF document text
    • http://vittorguxx.site/what_is_the_difference_between_cradle_to_grave_vs_cradle_to_cradle0ukt1.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/ea0UChb/73483309838.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/80337270746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_6ef8ccde217a4025aff606b990ce1a6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e38020-3c85-4920-9cb9-cfd5fee27fc2/do_resistance_bands_help_build_glutes.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/samsung_a10e_unlocked_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6d62b4-6c71-4042-8a3f-6da9c5157452/game_maker_studio_download_crackeado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9aeacb6-5c42-4878-b4d2-ac7fdda1cb08/overlord_vol_4_light_novel_hardcover.pdfIn PDF document text
    • http://wepikupovug.myartsonline.com/kleiner_maken_van_bestand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34f3eb2-162b-4727-a915-6bc40d655c93/dyson_dc35_parts_diagram.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/31805320226.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/affiliate_marketing_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/in_bacteria_endospore_formation_takes_place_during.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_bc0971ed7b6840278939f272c111f0ec.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_b47fc5aecda34a81998c138424287b37.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_dee07b0d8d93444d8da6854dffee23b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1549e813-fce3-430d-9f1e-7f2d88b3b51d/76632648437.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_33d77544a28549f39f003f3c83765b05.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/ir_spectroscopy_principle_and_instrumentation.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015351.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15351 18524 bytes
SHA-256: 2df11af93e104b72e89eee6a649c1984df08b84d55c18012d1ac5482da0d69a7
font_00_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 5556 bytes
SHA-256: b99a379c1008b14366689183542b2114a09922846a8fe3fac3d38c275e4e99f5
font_01_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 11644 bytes
SHA-256: 43a92e6ec8e792b5052a65aa0ef5b39b08e485a01ff3f0c6be22cb32dbdc85d9