Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9ad5788c8d423…

MALICIOUS

PDF

96.8 KB Created: 2021-04-04 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6c9d97381c6511fde661694467159c47 SHA-1: 7de28e80742c00365fff3842a0e1bb63a31be4bc SHA-256: 90e9ad5788c8d4237780772f6faf78bbc71615f1c8a06552d90cbb475106a4d6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent.

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/wix?keyword=board+game+page+border PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5fdba5e2664c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_602ebdd1ab3ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408713/normal_5feb0ece94132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5feb5c3186b56.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/88050013629.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/both_either_neither_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_600dfa05b254f.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/harry_potter_house_trunk_book_set.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonarubitexo.atwebpages.com/gizoseximugudi.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/cholesterol_treatment_guidelines_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0b9d41-d271-4fe9-bcc6-add28e815fad/53376040524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb67821c-a7b4-47c5-bec6-76a7efb36f08/skyworth_58_inch_tv_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8b2193-cd9e-49f8-bd54-8e0f5deed50c/viper_3105v_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e38b43-0305-4034-acac-5fafe952d193/onan_rv_generator_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb03e6a-7e80-49ee-92c4-8f3fcda6b5f8/sabedojitivavozi.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/bengali_cooking_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5f1602-6077-4989-82f0-909c7569c7f5/windows_batch_file_variable_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2122399e-c338-42da-ac56-7d9ffcb2695a/how_do_i_program_my_1056b03_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/operation_alamelamma_film_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac0296d-2391-44b3-9116-7dd7592c636f/9470882858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8949e3-a6c9-4b53-bb92-e02ab3419e21/fudowiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/caderno_de_caligrafia_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/buzididamesorum.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/kemuropet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8daac17-e60e-431b-aa5d-2f8492622132/81603710836.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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 25828 bytes
SHA-256: 0ac6b1171a57a6564f66e9744e586420df41c260e7d2833465f4657c27648600
font_01_sfnt_off00013e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5C 5256 bytes
SHA-256: b15b6858539c1e9c010acfe610c955051bb4dc929a3488a0e5d815b36f68df89
font_02_sfnt_off0001501e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501E 10964 bytes
SHA-256: 4b6e8bb73fc54824d6d7cb345dddb9d1bfea5b2510bd29b36f9d775627f3417d