Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc7759dc2c713e5…

MALICIOUS

PDF

89.2 KB Created: 2021-03-17 19:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 04c7c178be9560e5e45ef5d220824244 SHA-1: 5acbbc24584580494a070c3022ed00d5ec653d47 SHA-256: 5fc7759dc2c713e5eff11a823943f31d3c3c688bad75d9291640fba7a6b12137
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results. One prominent URL, 'https://ponafet.ru/strik?utm_term=what+does+daring+mean+in+french', appears to be a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=what+does+daring+mean+in+french PDF link annotation
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/996516.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/db90a1d14a.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/4d2b08d1d2a207.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/k09vggc/smart_screen_recorder_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/h0ogchj/subway_surfers_hack_android_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/IjUkifj/xizofasapubusuruzo.pdfIn PDF document text
    • https://nenusisuma.weebly.com/uploads/1/3/1/6/131606583/gomelugeg.pdfIn PDF document text
    • http://zoxenejuwu.iblogger.org/kozopobibuzotomaxinilitol.pdfIn PDF document text
    • https://rodugetimevo.weebly.com/uploads/1/3/1/4/131407281/7876303.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/wuzabefafajid-daduwup-joniz-vosudixegeti.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/09e560f4422.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/4bd260b7-e249-4cfe-b915-90d01e408bc7/freak_the_mighty_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8ef9d1-5405-4006-b74a-37d7bf1f4afd/68829763444.pdfIn PDF document text
    • http://zogufisuru.epizy.com/dilubogevepelodonim.pdfIn PDF document text
    • http://xasaduditomup.epizy.com/data_structures_and_algorithms_tutorial.pdfIn PDF document text
    • http://boxakuwila.epizy.com/idsa_influenza_guidelines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5735d958-8132-4f2b-b45c-e424ea91e138/singer_tiny_serger_model_ts380a_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbd4455-0762-4297-a04f-fed027b98ef2/what_is_an_example_of_a_marketing_plan.pdfIn PDF document text
    • http://fetopenatafef.rf.gd/hyundai_tucson_brochure_egypt.pdfIn PDF document text
    • http://viveguwoxifug.epizy.com/the_biology_of_belief_10th_anniversary_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763cfa76-347a-4e01-9a97-931e5af78727/52864079482.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_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 5416 bytes
SHA-256: 6954f5fdb9715dd1550d82f29421c96bfb8eb0e645e67bb0dd03f07de5975dbe
font_01_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 13028 bytes
SHA-256: a955c0a71f7211d10fc4d5a48648a3c2f5ec9b79ce5435042b3a254eb51b89ec
font_02_sfnt_off00014239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14239 16136 bytes
SHA-256: 51513064ad385c19c9e7fa40d43ef88e47f12a31dfccb88d92bb2b0ad7580f4f