Malicious PDF — malware analysis report

Static analysis result for SHA-256 248c0773dd66ba6e…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 03:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2d914f32e1de1e120fef3db35f65a0f4 SHA-1: ceb7c44d7a57efb6b02cb2893a640577326ea8b6 SHA-256: 248c0773dd66ba6ede797dead14303e1af5c6a132b7bf4bcf10b80e8b22b6c45
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wix?keyword=cells+and+microscopes+crossword+answer+key PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/Qid2Svq/hellhounds_osrs_slayer.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/uYggib4/xedimadotox.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/notonidonologusudoz.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/62835184148.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/joker_pencil_sketch_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/xuijhif/69565053741.pdfIn PDF document text
    • http://fumegowo.iblogger.org/avengers_theme_song_midi.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/agfTigf/capsule_endoscopy_images.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/jmiirgd/rilalavunawugujuni.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/xadilowuxesomesobuj.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/fde9aff6-6d92-4bb1-983f-95657742fa84/24495952341.pdfIn PDF document text
    • http://xiwomewumusebif.rf.gd/wonedogagefilunejilef.pdfIn PDF document text
    • http://zoletiwosi.rf.gd/goku_vs_android_19_full_fight.pdfIn PDF document text
    • http://valopuloti.rf.gd/gy6_150cc_engine_horsepower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5cad49-c65e-4100-802c-dd89b4ba8cc9/ludipafol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5f9f21-f3b2-4938-bb81-0dbf031c3d71/bezaxibej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec352fe-853c-4d67-aee7-b672dc27939d/78762592193.pdfIn PDF document text
    • http://zopegekole.rf.gd/76069613178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20b618f-7ea0-4033-8f1c-9e872dc2d521/moon_river_ukulele_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a99f8e-45bf-4e6d-a5a8-aedd0b4a6040/pisusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f0bf96-ba10-4728-8266-d54a803de81e/the_monkey_king_movie_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3de546-5039-4703-9390-23c93320fd93/wifezero.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 5384 bytes
SHA-256: 14af371486be9dae64e6ec3c94f7e64d1eca39908a1d6ceba2a931148c279bb9
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 11504 bytes
SHA-256: 9a9708654fda5408858f8ff5db6d06f84f53768517cfa7e9175bcf9d16fc876d