Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08835acce10b485…

MALICIOUS

PDF

91.2 KB Created: 2021-04-24 01:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 548f6671dbdd71ae6b5ba4c2c11f4eb9 SHA-1: 8d536c6e7275054b0d4e29cdddab593d056471a0 SHA-256: a08835acce10b485c2beb81130dc33e7262aecd1f925ae25a732a1ee619116b4
126 Risk Score

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 0.9996

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://lozipotod.ru/strik?utm_term=side+by+side+book+2+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/letijefa/ehgWFjh/my_superhero_movie_lyrics_copypasta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_60555645a27f8.pdfIn PDF document text
    • https://cdn.sqhk.co/diwidivu/eWhcxB5/pokemon_mega_adventure_android_game.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/dhfihst/90915176025.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/berejumezurubotenumifas.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/3932730283.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/23311710646.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuvobu/bjdih2M/retroarch_dolphin_core_not_loading.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/believe_in_yourself_you_are_amazing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5fed519864d1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe2bc16a852c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c3c13e-477d-4f54-8640-ac0e52052f49/3899523377.pdfIn PDF document text
    • http://fewabasutagit.rf.gd/gameshark_emulator_android.pdfIn PDF document text
    • http://xamukipadu.myartsonline.com/hmophile_dfinition.pdfIn PDF document text
    • http://tixinova.rf.gd/spanish_textbook_answers_realidades_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d923bd2-eead-42bd-95bd-5ab8b5f53119/zugupulibuvinodikekojop.pdfIn PDF document text
    • http://gureragiwoxoseg.epizy.com/lizibaxugakusoxela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ce03fe-aaf6-46b2-be76-d3a45f3d96fb/act_practice_book_2020.pdfIn PDF document text
    • http://ninivekav.rf.gd/astrology_application_for_android_free.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 5716 bytes
SHA-256: 41292bd8447f6097fec7c73e4c1bfaf45228da941b393294a269d2d41a802a10
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 14216 bytes
SHA-256: 97d0cdc9790b64393486612577a9ae4b826fba268cae6b23035e6031b093cb86
font_03_sfnt_off00014968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf