Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3665fd13e79bd41…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 00:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3005dccd6e82659ff3941a2c291e3426 SHA-1: 81ccf38af6058c1d41ed83416dbbd88d186b08c5 SHA-256: c3665fd13e79bd4131dafe0d3266a8b142993d6cc5e76c84b97e69af5a4f95f5
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 0.9991

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://baarspo.ru/123?utm_term=nc+dmv+permit+study+guide PDF link annotation
    • https://cdn.sqhk.co/medukukekuke/hfJphgZ/6879715035.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jkzeNjN/yellow_fins_hernando_ms.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/heieMhd/gugerilazare.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/jiBUhiT/96484716962.pdfIn PDF document text
    • http://1s.london/invasion_of_grenada_1983_apushrp0g5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_60195649013a4.pdfIn PDF document text
    • http://interstart.online/rafesaparutugatumujoj8h8gy.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/samsung_8.5_kg_top_loader_washing_machine_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/3M1ybhc/crazy_games_basketball_stars_2.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/jagavaviwepagafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_601487138dcd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382209/normal_5febd4611de49.pdfIn PDF document text
    • http://igcopyrightverify.com/ledilunusopuzazeromu4yh4.pdfIn PDF document text
    • http://goshop32.site/cell_reproduction_crossword_worksheet_answer_keyhacao.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/26906796324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_602c137d2cd69.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/47651829654.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/kgcLjdb/93403470394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_5fdc81f5b5f2b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/6Mmibwu/tv_show_quiz_questions_2020.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/daniwodug/53846626458.pdfIn PDF document text
    • http://negumigimewote.onlinewebshop.net/the_odyssey_book_1-10_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/zezebapikud.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/xabalipunelusuvisifutot.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/bibafosonuguburanetiluf.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 5280 bytes
SHA-256: 5e28910af62ee769f54b6999ff11b77d7c79c417a202cc0edba52236122a7839
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 11052 bytes
SHA-256: 79e00359800d36453545cae9b9facd01fc5a6fc4e3483ff350b2e3976768831f

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