Malicious PDF — malware analysis report

Static analysis result for SHA-256 b554a2b9a5f0723c…

MALICIOUS

PDF

90.4 KB Created: 2021-04-06 14:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8d8ca5f9239a4850542748b70f0cf1df SHA-1: 5107c2a6f914a0615539a72d8caf4836640c1409 SHA-256: b554a2b9a5f0723c0aba20a8226ca53060e20c14a57412cc10a0383e6ef7ef75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=curso+de+ingles+gratis+mec PDF link annotation
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/0705caab1acb3.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/3818941711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_601a7e14bd501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_603136b271f37.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/19543610792.pdfIn PDF document text
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/dugoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_603cbaeac3744.pdfIn PDF document text
    • https://tuwebiparixe.weebly.com/uploads/1/3/4/6/134674666/goxozagamopa-xilureroxuvulu.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/badger_insinkerator_100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_600e57b8c9ef2.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/keith_urban-youll_think_of_me_lyrics_karaoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xofalepelala/38092523260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cc45a2-95e2-4943-8f68-17f46994b5ea/element_tv_reviews_reddit.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_711067b83d3e419bb75f64edbe413772.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_8053c2180f1046d8b67511869b52e675.pdf?index=trueIn PDF document text
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_41d1d653c8384537a3f22b3dc12f8b03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b8cd4a-e566-4969-95d0-17caafb148e2/learn_english_in_30_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbb53bc-1bd3-4667-af9f-b2120175211b/simulacro_nacional_de_evacuacion_2019_octubre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005aa463-82cc-4817-b479-827078e2f3f8/4241637583.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/shingles_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/business_letter_writing_format.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_6b330369d8ae43bf8f817d4a269ffadb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f69a3a-b250-45c8-b4c5-c7da7601f4a8/scott_pilgrim_vs_the_world_graphic_novel_online.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/witebozino.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/68637302351.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_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 5164 bytes
SHA-256: 276055a562f44f7d5407c410c142a5753c2867823c17d340ec1b4ea5bfcc2223
font_01_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 13300 bytes
SHA-256: a80fbbb4267d000cb9998238372e07bce5eb16742a48db84d24a0437609221e3
font_02_sfnt_off00014c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C12 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361