Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d1a4d86757aab2…

MALICIOUS

PDF

102.9 KB Created: 2021-03-14 07:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d58d1ad04bbf2d1574bf6727af748eb1 SHA-1: d53c4ec20e27d653641c1b3eaaf3192e7f1af479 SHA-256: 23d1a4d86757aab21700f3b8f6925ced73d9a0eb655090fc88b6d4b82c68ebf1
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs, many of which point to disposable domains and link farms, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://maypoin.ru/strik?utm_term=second+great+awakening+apush+dbq PDF link annotation
    • https://cdn.sqhk.co/nivazesoj/cH1jfic/66857233629.pdfIn PDF document text
    • http://thecet.xyz/86473480439ygcb.pdfIn PDF document text
    • http://dlkmvkoenv.info/virusalibunejatibobiuk3fr.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/28694372557.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/58548570701.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/daily_words_app.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/cutting_edge_third_edition_pre_intermediate_teacher_s_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_6025738c664e3.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/gihdk1y/vuxive.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/xalenojasibur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_5fd903dadc9bf.pdfIn PDF document text
    • http://priz24.site/68727137109cvv0c.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/IGmibhc/zelimuvaroboloje.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/Mq8jeBa/atom._io_light_themes.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/how_to_carry_a_tactical_knife.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/gemupozivukuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/idhiMu5/cannonball_run_record_audi_s6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/50a2e6e5-29be-4543-9238-929d809d6984/echo_weed_trimmer_line_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8244d8b-9098-4a37-ab05-57c91016da0f/schwinn_my16_130_upright_exercise_bike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7e4917-f394-49ed-beba-fb72c0227871/health_and_safety_sample_exam_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9a8a98-845e-4071-b7c2-3e4c91630852/what_to_eat_on_a_gluten_free_sugar_free_diet.pdfIn PDF document text
    • http://domuromu.atwebpages.com/salikixapibif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34570231-8d35-474f-822c-da00b3b256b7/modern_warfare_battle_royale_tips_and_tricks.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/10731754675.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/pubuvulevalo.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_off000148fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FB 5708 bytes
SHA-256: d03cdcf78d8114383798c775595e21a3324721663c1f0e09e737425d7ef18a8a
font_01_sfnt_off00015c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C58 10400 bytes
SHA-256: d5e6b68884414cd2d6696aa08a7946017acefe815d7de092139cdba759324362
font_02_sfnt_off00017f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F93 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2