Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c88d1e39201e051…

MALICIOUS

PDF

85.9 KB Created: 2021-03-18 17:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76c769772046396777d48aa5a5ff9b62 SHA-1: 98072b6511eb0e37ae5413d0b116c190066c2e02 SHA-256: 5c88d1e39201e051a9c7142c64d5885218df358143ebfbf168f643538df0da26
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 0.9985

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://jumiwimov.ru/strik?utm_term=best+paper+shredder+for+home+use+2021 PDF link annotation
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/fetifuzufak-werowibe.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/1Xhjhji/97293459205.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/types_of_comparative_methodology.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/WgejfrZ/superheroes_city_mod_apk_an1._com.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/338284.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/fkYjahc/jibalixojobel.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jjMfs8N/aparato_locomotor_del_caballo.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/fogubexokanugitaf.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/6ThfGZq/2982629232.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/Mbhbhez/sutejuf.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/wigapanixigu-jogiviputaju-ripowixabovanev.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/LWVgijc/66972000541.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/jfBhehj/77128430713.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/jfjhSnC/fried_cod_recipes_keto.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/what_is_a_antonym_for_captivity.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/6401596.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/cicifID/tuvemojul.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/cshbhig/93885964583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lumosaneja.onlinewebshop.net/49935940322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a24c225-0b78-4ee4-94b2-6b80797a6e2e/behringer_xenyx_802_recording_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34c4234-ed36-4a72-a1ce-ff87ff04aaab/42217310546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f7d771-e788-4c65-87ce-dd2c0b1a94aa/31003121964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f96b8e-4c9b-4c65-8e5e-6a31d22252d4/10974687205.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 5352 bytes
SHA-256: 45f90fcd8f6609b3c8e983f0b3826b805a9a05592687e22dbc6b766247b4a165
font_02_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 11200 bytes
SHA-256: a4313c10608ea624dae6c188d35bf8a06b9db5f30ef6a9a80f39078cea96da10
font_03_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333