Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec528b150a5816bb…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 20:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2c4ce83435642cb7f5af45932ace3a36 SHA-1: a214a56e0b1da4640b58b044b4fee4b96015e895 SHA-256: ec528b150a5816bb2553806da3100c5e6f9f4d4d02f5c3e64fe00334add1bbb2
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a link farm on disposable hosting, which is a common technique for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=learning+spanish+basics+pdf PDF link annotation
    • https://cdn.sqhk.co/gevopobi/br3jcqp/oxygen_levels_normal.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/jjiJcge/dogudowazep.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/nmidvf0/96923395346.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/FJhc8oA/xitejedapitufebapatuvax.pdfIn PDF document text
    • http://pogetukexuk.66ghz.com/ave_maria_song_in_latin.pdfIn PDF document text
    • https://cdn.sqhk.co/fifusaji/hQK5Zqc/chal_chal_ve_bandeya_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/gfYPejF/69062718671.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/S6e8jhv/cbse_class_9_science_notes_chapter_1.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/eDVtMjs/digadakirunuranutira.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/48ac0869-b8c3-48cd-8aaf-65377031460c/31787540036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b74e622-0be9-4691-8072-b621e8aff9b0/kedawagiloxifuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae20ed3a-1800-45ad-a7f9-9f55630e544e/wugamoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65dab280-c26d-43a2-8a65-15fe65ab944c/gutenberg_bible_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/import_png_into_android_studio.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/what_was_tonights_new_york_take_5_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be2d602-e044-445e-ba9e-2a8cced508f0/how_do_i_unlock_the_region_code_on_my_lg_dvd_player.pdfIn PDF document text
    • http://jujovotusenugo.epizy.com/jaxajinupawodimomonopif.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/alien_covenant_dual_audio_300mb.pdfIn PDF document text
    • http://legunexalutazu.rf.gd/diccionario_de_dudas_rae.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/xupiraledomig.pdfIn PDF document text
    • http://zupizuzopet.rf.gd/the_blockchain_capital_markets_use_cases.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 5468 bytes
SHA-256: 0e2fff4a44e199c1deec27bc0eba7b0c25bf1a8f2c794ceb8b337d8403cf2bc6
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 10412 bytes
SHA-256: 06576022edbc00af2533bdd9001538b0f930733540ec0fc4def29a1271a7b7f2

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