Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18b8da21b348da…

MALICIOUS

PDF

92.2 KB Created: 2021-03-29 04:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 18241cd3b43078edfbd36bd44609627e SHA-1: bffeef6ff3d54b0ff3164f52fc55192c770a23bb SHA-256: bf18b8da21b348daf165f9b5be5baf931fc35cdc24b5a3aab160028d2ec0d69f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the document body's deceptive keyword suggest a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=archaeology+essentials+3rd+edition+pdf+free PDF link annotation
    • http://fbcopyright-center.com/north_atlantic_fleet_ww2ghdpz.pdfIn PDF document text
    • http://idem-peshkom.ru/powepemusepupewogdllu1.pdfIn PDF document text
    • http://ledimpress.biz/bundesliga_league_table_and_form1tw5g.pdfIn PDF document text
    • http://contarinihome.com/tewibulegubewuwis4kzw9.pdfIn PDF document text
    • http://opt15.ru/80647254942emrnw.pdfIn PDF document text
    • http://unlockdeals.shop/wagner_w500_power_painter_manual9v0wa.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/jeworurowam/vera_edge_ssh_login.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/fekupijipabizapofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6273bb7-5bfa-4a1e-a65a-330663a49573/whats_the_difference_between_modern_and_traditional.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_7921b4db102e420f9e9999d199bedfb0.pdf?index=trueIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_b597db9b2df94607aa75837085b67596.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d474b8-8a1f-47c9-a323-77eaf8ddb4bf/plot_decision_tree_python_sklearn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae4c208-b0c6-477d-933f-470f380d00f0/fivegojamebajerowuvela.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/goji_smart_watch_manual_dansk.pdfIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_1f67150ee7d1405b999c57f6098c8b1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ea92f9-4b40-4698-a943-83b8b2f7dcf1/panasonic_multipurpose_rice_cooker.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_49aab894de56427097fd1d7b44ec7a9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61149d3-1cfa-4a37-8283-fac6d7789c07/fodiboduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769592bb-f39f-4f9c-9085-989fd7709783/kofijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45378f3-b753-4d74-88f8-16a5ae226ddc/character_strengths_and_virtues_test.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_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 5672 bytes
SHA-256: 3028b96710a032c1b5a8146935a2c2ea2de831f65c1f89737cd71d52b4e2dd75
font_01_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 11840 bytes
SHA-256: 4615796641b4dedd251015cf76fa03ff3e3f61705ae0d02dd1a22fa03feb8105