Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdd28103b76d565…

MALICIOUS

PDF

81.9 KB Created: 2021-03-23 04:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db3fb4270e636883e7bd699f6ca16ab5 SHA-1: 095f9affd031924c3d4853d994550231e21c1112 SHA-256: bfdd28103b76d565951e4b8bcd917d0dda8974ff5beb4eb64d4e058872baaa5c
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/123?utm_term=hantu+kak+limah+2018+astro+first In PDF document text
    • https://lobududovidaxu.weebly.com/uploads/1/3/3/9/133997350/8851866.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/jorefopevesig.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/kisekitetefilavexapu.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/velode.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/fezeg.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/84509028003.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/52082587604.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/1dd97eae2b0a.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/46980516965.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/c34cbf1b-220f-4f19-8c9f-fb9ab9568af4/2005_honda_trx_350_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c878bb69-2cc2-43ee-a3e0-c96239d767e0/define_positive_reinforcement_in_psychology.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/roziged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94cd0b7-b115-47d7-8db8-ee7bd0869efc/digital_marketing_course_price_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e26b7-6e58-44c8-b2cc-5ccd47c44f69/kuxadadepizo.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_4b06210c7a434832a4b2b42aa7052f8d.pdf?index=trueIn PDF document text
    • http://zedowep.atwebpages.com/atmega16_microcontroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b7cd5d-7952-4dd8-91b3-bdda13d1d0cb/jerigoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be1a5b2-631a-412c-80af-40b5b3240fdf/mopowodixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe77692-4dbd-4f6b-ae8c-5dfaa95ea8f4/midotaxixejadebenu.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_a6bd86a551944beaab5de8ab80bfad2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c06e88a-9e12-4733-ae43-03c9a4c6e00a/befarut.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 5552 bytes
SHA-256: d5e0cde7809cf9b5ef52f19dac9f3d0d04fc6bd6403d070038884e0654bd5a2b
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 11068 bytes
SHA-256: bc95b76cfdaee2ebb23a956837fe96d1f2e57cf635c89c4195345a98e8a89204
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 17356 bytes
SHA-256: 69b00587f5fe4c437ca35e6548c1f043f907ff0d2265aa98f7c30d8187fa94b2