Malicious PDF — malware analysis report

Static analysis result for SHA-256 59847eb2208bbf3c…

MALICIOUS

PDF

67.0 KB Created: 2021-03-30 10:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 254d5c3df913eb546af8c78cf0c4610f SHA-1: 8e2af628468d11c1f4b05cc1df8728a596373fa7 SHA-256: 59847eb2208bbf3c788294ae1afd67e6eca5dbf429bdaa85353a3adf4a47202d
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one specifically to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Keurig k45 owner's manual', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=keurig+k45+owner%2527s+manual In PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/a8d0d4094da2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_605af4f435dfd.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/fIKXnhg/clerks_private_sector_award.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/xapegoretusu-jaruxurukarixo.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/vitivopil-wojujadixepej.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/W0fkBvU/jidikaruwof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_60330d270480f.pdfIn PDF document text
    • https://sedesafatowezu.weebly.com/uploads/1/3/1/4/131437285/subuzex-gusegojux-folapotixev-xiluzagupazujek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5ff783fa53ce0.pdfIn PDF document text
    • https://bajozofexowabir.weebly.com/uploads/1/3/1/3/131398176/b6b003c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_6023656d84d51.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/7754386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_601f062d88fd9.pdfIn PDF document text
    • https://firalikagux.weebly.com/uploads/1/3/2/7/132740609/gifam.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/4ie7ja1/lipubijejipafimozuxifazig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5965235-b44c-4bc2-bfc3-5a3079f82b61/glock_19_gen_4_vs_gen_5_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e261d6e5-0546-47db-b40f-2cd22bfd548c/80735327891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2816f8-f747-4f89-bcf8-4b119d48f8a3/39270339957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7827d878-1f43-40e3-bc90-44eac69d2abd/lasko_box_fan_replacement_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b59cda-ff60-4285-b6c9-5f413f8ef2a6/gonifal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5cb37c-9a6f-445b-9d00-2358772eb189/fluke_435_series_ii_power_quality_and_energy_analyzer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937a1ceb-a257-484f-a5a2-21e87196b750/jugegeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952c5cd4-e911-4479-9824-015782e2afc2/how_to_turn_5000_into_a_million_book.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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 5376 bytes
SHA-256: 8a590257dccbcd57c14b832c9c1c651e98787274435e6fd1d1ba8e505896fc8b
font_01_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 10480 bytes
SHA-256: 105c4ae901eb3504ad3cff8215d06bfc6caaeecd934b491e8e2b4b31220de97f