Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2572ea5db79056…

MALICIOUS

PDF

80.5 KB Created: 2021-06-08 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8bb3191170c97be19605e003b70f8bc9 SHA-1: 9b265bd7698d9108f18bd262496d09c63289ef03 SHA-256: 5c2572ea5db79056fdc8711d5558302f4490b33a695d1218f75c597a751626e4
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 0.9967

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://catamma.ru/pbw?utm_term=tekken+5+ppsspp+game+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496584/normal_5feff004a85de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fce06c5aa217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_604860f852c43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_6005c906117f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6058fc8ab7513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fe302ef58555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_605a1e2411c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5fea196550c33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minuwaxiper.pbworks.com/f/adobe_illustrator_cc_2015.3_crack_amtlib.dll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ad3fe3-ca50-4094-8ee0-0b2580217e49/8859187927.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144460626/descargar_dragon_ball_z_tenkaichi_tag_team_ppsspp_por_mega.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144424986/tajutubufizadizojinokin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46381d7d-988a-4d95-b3cb-b787a529a770/mijenol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279ee3f1-529e-497b-8406-bde4690c74ba/narasimha_karumanchi_data_structures_in_java.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144484782/duel_of_the_fates_piano_sheet_music.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144608103/tamun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4ee2cf-763f-43fd-8ea9-54d525c1e02e/39527402644.pdfIn PDF document text
    • http://figinav.pbworks.com/f/baldis_basics_game_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b440cd12-16f1-42a8-a018-98ee67448444/90962319502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bcc7dd-82f8-45ef-b76c-80e99083b064/is_the_other_side_of_heaven_a_disney_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3c6b85-145c-4cee-9a39-b018ac664811/robbery_bob_2_unlimited_money_apk.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/gabezivuvofefudizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cce6ead-48ff-4388-acbc-8e9856d153a5/gomebotulikujuzujubabipoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715943b9-397c-4a80-86d2-6765c56cbcd5/how_to_change_battery_in_petsafe_dog_collar.pdfIn PDF document text
    • http://lodedeti.pbworks.com/w/file/fetch/144718032/is_photo_taken_at_passport_office.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f923187-0f1e-4814-a3de-736badc690a4/what_does_mercutio_think_queen_mab_has_done_to_romeo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 5412 bytes
SHA-256: 9815254f95737d24e71750e8af210e72c9aa814693d5930c784eb0ca7f567b7e
font_01_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 10704 bytes
SHA-256: ab2142ef1b8b6066228549d3ddfc442ae1793ef3f479884201c424b3540da165