Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66a849b2489a8fc…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 04:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8d7120054f7b949714cd2a57b0b75bd2 SHA-1: 8a0c04564f4dce3734b22f522335f40cba615afb SHA-256: e66a849b2489a8fc85a977d734fc3715b31b5418fb6b828c6027c5115321760d
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically targeting a search query for 'watermark pdf adobe' on a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://kuzutuzo.ru/award?keyword=watermark+pdf+adobe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480745/normal_603b93c95c689.pdfIn PDF document text
    • http://idem-peshkom.ru/data_structures_and_algorithms_in_swiftvpa1w.pdfIn PDF document text
    • http://jewlgems.com/36150969651ft6gw.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ggdgdgf/brick_game_pro_19._9._0.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/Izgiiaa/regal_theaters_reopening_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_6024c7cbb6ac0.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/djdjcia/kuremuvenopejuxugudakopob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_600a71f957393.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/gfVgBhd/rubber_chicken_toy_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602d02963c0f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_60650ab962910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_60125cf57b609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_60547a428e9f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_600635ec9d66c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fe58e919b2a3.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/lebejos/pes_2016_smoke_patch_8._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560641d3-38d6-44d6-82ec-26d4c58f13fb/which_of_the_following_are_advantages_of_community-based_corrections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6b4059-80fb-44e8-8378-14cf155c1fd4/apc_back-ups_es_550_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6f6c6a-6cbd-4388-95b0-186f0e79d040/how_did_the_great_depression_affect_america_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf51b30a-0bef-4d57-9f05-e469644e8fcc/zodibetalosinaxukid.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/28847394429.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/top_android_browsers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec5fda1-6e51-46d0-8e99-cf2494a61f8b/20323534751.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 4828 bytes
SHA-256: 17624f4a70a68d5029c0738f3f6e97403f0ad0ea28a67837ec1019d0b27aad23
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10744 bytes
SHA-256: 2cce4e59cede43a03cfec9ec76f4752fcda7efffdac2280b3c51960f8100ad08
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f