Malicious PDF — malware analysis report

Static analysis result for SHA-256 784049933b0bbdc5…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 09:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b4d941e9fdc9c6b32f919ccae2b4e582 SHA-1: 52c1d51af4e51df2c0c5b3aa526e09a7fbe2d3e1 SHA-256: 784049933b0bbdc5228ec15effd1e60975c7e1e195d12d44113ac4af51b87521
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xajibur.ru/wb?keyword=theories%20of%20communication%20in%20education%20ppt PDF link annotation
    • https://cdn.sqhk.co/naziwixolagu/jcjhhjt/13139548788.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/ieidjgR/45844256554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fe33cc328a43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_6005ac84bab3f.pdfIn PDF document text
    • http://penageli.getenjoyment.net/tipo_de_comunicacin_celular_que_promueve_los_anticonceptivos_orales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fdba08f5a1a4.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/SifBiaj/flashlight_gloves_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5fe40c6d83375.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/32728142464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_603b3e28246a8.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/eihjji2/top_20_nintendo_switch_accessories.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/interior_and_exterior_angles_of_polygons_worksheet_with_answers.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/cambridge_igcse_ict_2nd_edition_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/ffa_official_dress_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/jibozuxoxodoma.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/aula_4_curso_de_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/4229549146.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_8c512883c997400fb809b747bfc65fab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ca455e-cf2e-4c5f-96ed-51904251966b/16506712015.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_e479d3210bb54ad6969c0386ea8bb124.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/become_a_better_you_joel_osteen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc09f708-c4fd-41cf-8baa-f3b8080c859f/boxesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d9699e-b629-404e-b3ef-b3787e4742b3/delofapasinujokanat.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_2e3ba2c6559544a185b0bc7177f756ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/277a2ab4-ea9d-4b5a-8e39-8338f18c9532/13643172921.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_af99d9b9f1cc43de8e4093ee93c001b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/english_film_songs_free.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_76e338fd82d1475f977a8c865927bdc5.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_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 5312 bytes
SHA-256: ae9c60c94f769893b87cb390f5c887a2d9f71c6522dcedd384868428a9035cd1
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 11096 bytes
SHA-256: 843876ae63c18c224901c692d787fa112a3fab9621344db6e1f3d86d0c7cecad

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