Malicious PDF — malware analysis report

Static analysis result for SHA-256 4975b5fba4461fad…

MALICIOUS

PDF

83.1 KB Created: 2021-03-06 17:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9a7ac8391df0b8fd2c2fbabb1e82584 SHA-1: c41f250fe7051aa06e0ad173ea04847aaec42ba7 SHA-256: 4975b5fba4461fadf4a924b0853f93271433c886ea7380d35f0b0fe213c65cfd
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, with several pointing to disposable domains and potentially malicious content, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to movies, suggesting a lure to attract users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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://midufefew.ru/wix?keyword=best+hd+dual+audio+hollywood+movies PDF link annotation
    • https://sujugixuguxidi.weebly.com/uploads/1/3/4/6/134615921/sukunazeke.pdfIn PDF document text
    • http://comp-arenda.site/verbs_list_with_hindi_meaning_freexviup.pdfIn PDF document text
    • http://3gusevshop.space/15505576206jzdoy.pdfIn PDF document text
    • http://lisolu.org/51757945965zfujf.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/how_to_eat_fried_worms_online_book.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/subatufarilipigu.pdfIn PDF document text
    • http://marketitaly.pro/modelo_atomico_de_bohr_ao_y_caracteristicas31e3y.pdfIn PDF document text
    • http://7lessons.space/92933024540c6n8u.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/57826391735.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/rutidififaxew-ximelobo-xezazakuripid-birarenuso.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/58c95386a0682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e6dfec-763a-47d5-a8e6-bb87a45a7670/24258146703.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_ddcc7365aa1d4ad2b1a5149c64ef841c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulazelof/meliwafanijos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa30a8a1-4362-4466-aafa-6209417a95e5/guwowudezanadirib.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/46576823434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c169832f-9245-4502-8713-5aabeb670007/mcat_sample_question_paper.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_f00849a2dc1142138d2b7f73133ac000.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6750abc-8398-4692-8dbb-d4a5eb3fc1d8/rejewedidabuzitejugonepix.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/abbaigaru_pelli_naa_songs.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_e619362509f84091beb6f9039b766835.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/lokutogigejemar.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/84999538221.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_1b98c627ceab43f587f34aa7093053e6.pdf?index=trueIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_9792f3806c2345b6af917cc2e802b82f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/77918146575.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/multiplication_table_till_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c4e97e-3f9e-45c6-946c-1cccc8a0b085/schwinn_womens_riverwalk_26_bike_weight_limit.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_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 5272 bytes
SHA-256: 17180ab3bbd2a8dc820e381c2f1bbf38990362c088ea407c43255fd6d9bea6b5
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 10672 bytes
SHA-256: 5805d102da999a9391eab532dfbef265290d8404dedc149627e6e27b990e3348