Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6986563c98d8be3…

MALICIOUS

PDF

74.3 KB Created: 2021-06-03 11:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eca36af4455c07c19ce08566c31ee75e SHA-1: 900f33055d8eeb17c61093e3298c33f447115595 SHA-256: b6986563c98d8be3b018f02b77f47274cbd48389c1a0c2bc0ce6989533f11e80
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://allytemp.ru/pbw?utm_term=theory+and+practice+of+counseling+and+psychotherapy+9th+edition+test+bank+free PDF link annotation
    • https://jifozotuno.weebly.com/uploads/1/3/4/7/134758187/lizoge.pdfIn PDF document text
    • https://vokafevevuw.weebly.com/uploads/1/3/4/3/134320681/baxeborijolop_jalusulaj.pdfIn PDF document text
    • https://jowukore.weebly.com/uploads/1/3/4/8/134870909/pesedapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulasamesi.pbworks.com/f/csi_apostles_creed_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5de29b-29ce-4232-9bf2-b307b1ecd452/james_baldwin_death_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd35b0e1-3e14-4743-a3fd-fbecdce48212/diana_her_true_story_in_her_own_words_free_download.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144415620/48180074782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb90531c-54a5-4dfb-b3cf-565c9a304904/how_to_repair_timex_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edae2bd5-50fc-4a2a-b58a-025fc1dcbba4/vuguzuruxajuroxoponozo.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/72225495242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14ca4e6-7cfa-457e-8993-7a08be8951de/49110140279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df09ac2-29e4-44e0-abdf-2dd17f9498a9/how_to_fix_overscan_on_vizio_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472286e5-d46e-43b5-a9c3-3642e49b9952/an_inspector_calls_movie_2015_watch_online.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/zatezujasifujaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64413eb-7565-4fb1-ae9e-57deb1c422f7/angela_maria_morales_velasquez.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/glencoe_physical_science_chapter_18_review_answers.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144536487/97815944986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787127ee-4e5c-4aa1-af41-0c5d9d0c1885/how_do_you_change_the_batteries_in_a_swiffer_wetjet.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/bipukevewaxutij.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144491760/exercices_les_familles_de_mots_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbefea5-5e37-475d-8d49-f15924c4e34c/worupos.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5828 bytes
SHA-256: d274f4a3edcb372310f82a032eb3169ec1d71735ce01f2d1246d31ec4706044b
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 11096 bytes
SHA-256: 08735f04f228b25f3ff97e7f3c9edc3ddaf723d9aa364cf459a67d62db991668