Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f846af50122851…

MALICIOUS

PDF

163.9 KB Created: 2021-03-13 17:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7e289d8ecd57d7d10f61487d8ab4eda SHA-1: be14902d6cf27b0b76e49f5179a00ec3eec08f9c SHA-256: c7f846af501228511154bc05d09c2a825c029587140da6fff666fb2109cb6a52
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'Ufc strawweight fighters' and references to PDF creation tools, suggesting a lure for users interested in such topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/aws?utm_term=ufc+strawweight+fighters PDF link annotation
    • http://lozipazom.sportsontheweb.net/ielts_general_training_writing_practice_test_with_answers_2020.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/what_is_signature_valid_in_aadhar_card.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497372/normal_6002e7f23ccdb.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/80103965644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62f9a6eda8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6042d0e09c065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5ffac45ba4ba9.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/pibajuwi/iceland_guesthouse_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7c37fb-5fb9-4f95-a44e-aeb41bfb2ae1/what_is_the_best_home_elliptical_trainer.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_68cfadc864154a209e0d096277f5d5e7.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_bb28763e9b314b55ac737ed658ef9443.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/15131062264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2586aac2-45fe-4c6c-86c8-7f6b5e899506/muwetitalizasoneka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ecaa46-d97c-468f-ba55-1970c38bc061/belkin_n150_wireless_router_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/clear_cache_android_samsung_galaxy_note_8.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/goxuxoge.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_10227f685c434ef3a8e89ac3d516e6d6.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_a0e26029c4b145cabe66616686657c73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2dda2d0-7572-4e08-91ad-9501e2b2337e/mokutuwenobale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94876126-7095-4e74-abdb-ed9632bacd81/to_kill_a_mockingbird_chapter_9-11_worksheet_answers.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_43576166603d45d393f173ea7b3d82f5.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_off00023f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F64 5196 bytes
SHA-256: 83c0465f5701d5e3619e3fd398596469dab2f8fd514c9bea01e71cfdfd62efa1
font_01_sfnt_off0002512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2512C 17192 bytes
SHA-256: c9d7f9e18a521ffdcea404707b7ff8b06e03ed751b60ade5fb4f5d253947f279