Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b3b41f50458a8b…

MALICIOUS

PDF

72.0 KB Created: 2021-03-14 19:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7e187877adbaff3012436801e90cb58b SHA-1: ef7616f1404eae9167c10e86265f93eb2cad6164 SHA-256: 27b3b41f50458a8ba71a4211648490e9941dce70b5796ec043e6b01ed38a90fd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xajibur.ru/123?utm_term=laughlin+nv+10+day+weather+report PDF link annotation
    • https://cdn.sqhk.co/nanagajog/ghifbrH/evil_sudoku_puzzles.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/apgeaie/ice_hockey_near_me_uk.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/207ec64.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/zubapezarurekojixadojop.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/dipozaravovasegunox.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/gezil-weson-jefap-kakinenez.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/ciaWaha/dupenosizufakigilonelin.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/6557275.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/las_mejores_universidades_de_bogota_2019.pdfIn PDF document text
    • https://minajekefejuwow.weebly.com/uploads/1/3/0/7/130776819/pujajozipi-ximaluromob.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/6jf24Mn/kodugorozorupo.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/fuvixatilapo.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/mgf3Ggh/nufejotikunaduroto.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/0Ihrgcy/qs_world_university_rankings_executive_mba.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/jbFjhih/12438004960.pdfIn PDF document text
    • http://pegujanixur.22web.org/63657912839.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/wamoxikekagopub.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/kRHZUuu/2027344443.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/aJifYyl/9520272909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/monster_illuminessence_led_strip_mood_light_kit_instructions.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_78ee88b01103405f8dd911a782b42b69.pdf?index=trueIn PDF document text
    • http://tobisijukufoki.epizy.com/avaya_18d_call_forwarding.pdfIn PDF document text
    • https://aab3b5a3-3501-4647-bf8d-17d8175ff737.filesusr.com/ugd/87b9a8_cf4883b47bbf4ca6aa386d4022737acb.pdf?index=trueIn PDF document text
    • http://pobakojez.epizy.com/19th_amendment_to_the_constitution_sri_lanka.pdfIn PDF document text
    • http://zejaseli.epizy.com/edenpure_gen3_model_a3729.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/super_walmart_near_me_open_24_hours.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_d5441f846a4c451689a718dc50b33fc4.pdf?index=trueIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_ad7084929d1c4959bb71443bc36bcc70.pdf?index=trueIn 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5432 bytes
SHA-256: bb6f9f5ea167fad4e0812545da366c70ee0ca96ce964d29e2b5752a3f04ecd40
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10396 bytes
SHA-256: a42dfd6c14bdf74706e3495cff8b74fc6a28951d74cb990a078abcd3ab991fc0

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