Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67ae5411ba28556…

MALICIOUS

PDF

74.4 KB Created: 2021-03-09 02:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bcbbfedda4484e0ccea54ee30aa55d09 SHA-1: 1a234fef620abc06861cb32beea60ad69fd956aa SHA-256: f67ae5411ba285564ddd9f08db7386519b8759920a4a7afcc878e58c3e008320
186 Risk Score

Malware Insights

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

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 0.9997

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://fokemale.ru/award?keyword=out+of+the+shadows+anne+marie+west+pdf PDF link annotation
    • https://cdn.sqhk.co/satijumok/jachggi/infinity_pool_airbnb_miami.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/4979611.pdfIn PDF document text
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/4cdcb68e9a9649.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/d0ih5ib/58191386603.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/ih0gggc/42933030615.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/1486231.pdfIn PDF document text
    • https://pemowazazafal.weebly.com/uploads/1/3/5/3/135385959/xaselizakimo_vopeses_kumesovax_lajeginatejim.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/4277712.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/wetowuzuxit/gunariled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bc0f2e-f1aa-4c68-818f-9d2a920df6f5/this_sex_which_is_not_one_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d03fbb-ae14-4e04-86c2-85774b2c2ae1/everyday_zen_by_charlotte_joko_beck.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/gutanuwuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/rosudazum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2a7058-b456-4287-b639-bff05d219df2/zimemenemikirogix.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/jigemafop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbb8871-b1a7-45d7-9deb-ef78f40e8398/xenipug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbbc0e7-6d13-4a9a-89ed-eb4c47125c65/30130342748.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/wifako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5960604d-f416-44cf-9369-c469645baff0/how_to_thread_bobbin_on_brother_lx3817_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/9169040197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0152aecf-dc63-42d7-8556-eb23d882dca5/rexewiwe.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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 5368 bytes
SHA-256: 2c7574f9f2e48d0b3b9cd58b118c0299df1a30c7711708278031a683b36a44eb
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 14844 bytes
SHA-256: 7cd0b9858cb124f9231a6af1eeed01de6dc5e9a006639960e6e9d207787445be