Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde186d2a35ab2c3…

MALICIOUS

PDF

76.8 KB Created: 2021-05-18 23:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 522207335b1c33a0454c4e23c00ba347 SHA-1: ed7c15420a025372ae65b5d6241a34db5ab394e1 SHA-256: fde186d2a35ab2c3ba7defc7e3852ca73bb10b803083865a0e810910ebaa9af0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though corrupted, suggests a lure related to physics examples, which is then used to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=ejemplos+de+energia+cinetica+en+fisica+resueltos PDF link annotation
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/depadowesopunaziwu.pdfIn PDF document text
    • http://tugalakalat.22web.org/mfc_8480dn_wireless_setup.pdfIn PDF document text
    • https://nigakanal.weebly.com/uploads/1/3/4/5/134527226/koxire_pedeno_fulopavudam.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/8312876.pdfIn PDF document text
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/setagep.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/338dcf5b0faa.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/2741550.pdfIn PDF document text
    • https://mogavibebeza.weebly.com/uploads/1/3/5/3/135318512/8389599.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/noxaxow.pdfIn PDF document text
    • https://pelirexasi.weebly.com/uploads/1/3/4/3/134352860/vevupukugabimepog.pdfIn PDF document text
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/korisitimes.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/pitides.pdfIn PDF document text
    • https://daniveledize.weebly.com/uploads/1/3/4/9/134900130/zudejafexewobupokilu.pdfIn PDF document text
    • https://kurogokolazol.weebly.com/uploads/1/3/4/7/134751625/4158374.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/gawabog/29826663822.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/xexapomeluxivazoxonut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdc954b-2521-4331-8b3a-83ec4501b65a/lodevob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfda9e76-74c1-4a27-8de6-2855a56b5c48/fedex_store_hours_new_years_eve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93259ae7-0cb5-4a93-b4c2-b0a301da36c8/simple_interest_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623d9826-54db-4d03-8a90-16e5bea31e9a/how_does_vicks_cure_toenail_fungus.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/45654590385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeafe759-11c8-4127-b303-fe7eb2705226/46775153004.pdfIn PDF document text
    • http://rojazudawawuse.epizy.com/what_is_tyndale_bible.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5508 bytes
SHA-256: 23f1b00159cde3cbd226a41a3b5695caafcd9d6ba5f2006b4f86b1783ca7c35d
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11856 bytes
SHA-256: fecbf8de423f0a892d217b8b08a680343ea7194171ebf8b5c8760859f54f3d85