Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d647d19d90d82a…

MALICIOUS

PDF

109.2 KB Created: 2021-03-29 21:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9ad998ba12da4432ce43914207c016d5 SHA-1: 966a26dbdb0b631e0c5a7436e2303589ea2c9566 SHA-256: 31d647d19d90d82a120c98376d9f8844f3523a3f19dbfb839bf3ee881fe8c22b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to manipulate search engine results or distribute malware via the linked PDFs. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://zajinet.ru/wix?keyword=touching+spirit+bear+chapter+7+questions+and+answers PDF link annotation
    • http://megidexabaror.mywebcommunity.org/jixelibuvikabevejad.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/9437986.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/goxutakowifojo_fukegana_zefuribetidawip_xaresozide.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/mavizilozuberax.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/zusovadaf.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/pozesokinovami.pdfIn PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/2825505.pdfIn PDF document text
    • http://dexiserabasavo.mygamesonline.org/nubewumulolagaduzunes.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/5670790.pdfIn PDF document text
    • https://cdn.sqhk.co/sutekepape/ghghjSe/dhaani_chunariya_hd_video_song.pdfIn PDF document text
    • https://zizowotedudoma.weebly.com/uploads/1/3/4/6/134641453/senogofipepovok.pdfIn PDF document text
    • http://pagujubemozakev.22web.org/old_newspaper_template_publisher.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/cE8PX0i/38105244015.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/gokire.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/jcJhdjf/find_new_friends_on_facebook_by_location.pdfIn PDF document text
    • http://japisonaxem.22web.org/73944174682.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/hhLihjd/gugitifowuminijumuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufojokene.rf.gd/84847644167.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/business_law_book_for_b._com.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/23171467308.pdfIn PDF document text
    • http://xikimafelote.epizy.com/srs_airbag_system.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 7260 bytes
SHA-256: 75f183892ecb2b656d77ec9489c1726a433c5b9ddf8e7dfe29d6e80d99c26071
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 5692 bytes
SHA-256: 67a1e209a41ac4055b118c128fdbc38d55d264990441c548bc958dad04817c1e
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 6196 bytes
SHA-256: 0b7773adec00f4f581f0940b556028a0afc7430a84bfa9f81a0b04a6d615d3a1
font_03_sfnt_off00012ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 2232 bytes
SHA-256: 4144ca32428b4d7da411a727234d359a81a87b7c04e13759492fa799df8e56e3
font_04_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 25372 bytes
SHA-256: 59f2f70aca5c9e3524e705c165da7cd78b349507023af9b4e8bf8f14de6cd5cf
font_05_sfnt_off00017925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17925 17776 bytes
SHA-256: ecd7e7e4e501755c76a07e83acd0d70502eb992fb2d5e93950fd153afc994332
font_06_sfnt_off00019489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19489 6380 bytes
SHA-256: 8147ebbbea678cc3712649b21998cb4e826235616dfc010c520b9a53127ac348

Open this report in the interactive analyzer, or submit your own file for analysis.