Malicious PDF — malware analysis report

Static analysis result for SHA-256 105c8e9757c1cc09…

MALICIOUS

PDF

97.8 KB Created: 2021-04-25 20:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: de84b3bb662c1ac612e727e40fe6130e SHA-1: 80c2ff5554cfe49fc84b41f147d6aef86f64d03b SHA-256: 105c8e9757c1cc09cbe0c088afaff16a1aa0af93403c3a1b12f3d66505ddeaa2
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 0.9992

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=fanuc+programming+language PDF link annotation
    • https://jatekokem.weebly.com/uploads/1/3/2/8/132814322/3085167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_6052ce50188f6.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/xululakupewo.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/6131062.pdfIn PDF document text
    • https://xorataseturife.weebly.com/uploads/1/3/5/3/135333409/wukokikuzimu_kufanuv_digemosimetep_zujesos.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/8432710147.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/34addc37cecf052.pdfIn PDF document text
    • https://mezepimera.weebly.com/uploads/1/3/4/8/134860759/7491155.pdfIn PDF document text
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/rezarevad-vewexiburili-gejiwirekadas-sajegixinivuk.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/kinunagewagoxejup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_601ae9a91a2f3.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/mlk_a_letter_from_birmingham_jail.pdfIn PDF document text
    • https://vefenebef.weebly.com/uploads/1/3/4/8/134885139/zapen.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/piroz.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/rozebiradarifoxesodase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_602300edb89ca.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/gerakiva-sebonovupo-mupuvusafamal.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/bebofosozuxemewerugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotolen.epizy.com/46984932601.pdfIn PDF document text
    • http://vanudedu.epizy.com/avaya_partner_acs_r7_programming_manual.pdfIn PDF document text
    • http://magonusu.epizy.com/xowirewogivofosekelotudo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 4016 bytes
SHA-256: 403effb9c3c639814c148cac1e498e74bf8eb2f2dc2f9263a666fdeaf4abcb47
font_01_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 5028 bytes
SHA-256: 407c07cbed8df6ce0965d56a11ded3ac7479e6eda3fabe8c6af5662464270680
font_02_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 11752 bytes
SHA-256: ce6f02071ee9af381cc4430cf0c6febf22ae8182ac2a36eb3243564ebe1e3da0
font_03_sfnt_off0001629b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629B 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44