Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d2eab081eb48dd…

MALICIOUS

PDF

166.9 KB Created: 2021-03-17 00:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ce656e7af1c6b67a2bfd450a833d669 SHA-1: 5d1bd8272fa0a6aa7281a0d31a1565e2f35d3c99 SHA-256: a7d2eab081eb48ddd47ca67a0da30b5792cc27140d4994648c957365497fa3b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9979

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://seumenha.ru/award?keyword=auditoria+de+sistemas+operativos+pdf PDF link annotation
    • http://bridgecommerce.com/456164251964r2qq.pdfIn PDF document text
    • https://jebigifapiw.weebly.com/uploads/1/3/1/3/131379276/juvegagu.pdfIn PDF document text
    • http://qlemelest.online/toca_life_after_school_apk_free_downloadx93f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fdd1cbc65fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5fe04464144ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_6033d4c8af8d0.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/mfjdjf9/allegiant_stadium_jobs_bartender.pdfIn PDF document text
    • http://afracheat9.xyz/what_are_the_different_types_of_aquatic_ecosystemsf11ot.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/b7TThjS/grist_mill_fire.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/yiajYjb/dad_gives_son_haircut.pdfIn PDF document text
    • http://kernig.store/fewurobugebild3ei.pdfIn PDF document text
    • http://trastenmyqort.online/quantitative_aptitude_questions_for_bank_po_examgen4a.pdfIn PDF document text
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/duzaredo.pdfIn PDF document text
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/vozarixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374542/normal_5ff476bc56f6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fcccccd57f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/djcaQij/83688532270.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://uploads.strikinglycdn.com/files/5697c5e6-f568-446e-9a34-208fe29ba7b9/logitech_k400_plus_wireless_keyboard_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/93215191024.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/14427510043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d193cc-a999-4000-b36d-22a58616ed94/ue_boom_2_charger_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/what_is_a_competent_leader.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 114392 bytes
SHA-256: 0caf4736b665b3a9d453f9e26a0578ea66c61fc08f46cc4db5f0775b588c3d6f
font_01_sfnt_off000243c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243C4 4980 bytes
SHA-256: 4fc9e8c797f7215340ae54d2638ebe917f994438b8f1bb962ec74fee37e24b43
font_02_sfnt_off000254be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254BE 11712 bytes
SHA-256: cd99f4f0a5eb80dc08b155e5408bf0bc97996e288b1d8570f0b26cef087197de
font_03_sfnt_off00027cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CF4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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