Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6609b3708c51a1…

MALICIOUS

PDF

92.0 KB Created: 2021-03-26 07:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 118a5729d4383e61162c6455bb5c708e SHA-1: 27569fc50d67c752bfa0bf056f4c52e99a638fbe SHA-256: 9e6609b3708c51a1568b50a2200e18c4194e57eefa65348554d5ec0f2c04ea30
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=affairs+cloud+computer+quiz+pdf PDF link annotation
    • http://lozipazom.sportsontheweb.net/vajanabenatex.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/anatomi_pencernaan.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/the_go-giver_expanded_edition.pdfIn PDF document text
    • https://xepapure.weebly.com/uploads/1/3/4/3/134367208/katagowakeroxo-peruvapoti.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/6580224.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/venesojatejim_gutem_gizitilelu.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/causes_of_tumor.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/37060856490.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/4401644.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/fjdulii/fotugupavulagatub.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/685bf9b59d4973.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/sales_engineer_interview_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/Toid1hS/nurasepewiwomutugima.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://solezod.myartsonline.com/eukaryotic_cell_cycle.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/ford_mustang_ecoboost_engine_upgrades.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_2fd9587af20140d3a19afadd7c828bbe.pdf?index=trueIn PDF document text
    • http://salajire.onlinewebshop.net/possessive_nouns_games_for_4th_grade.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/backend_web_development_tutorial.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_812147c45fc54e38a5b6b42f727a8d96.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_186e9468adcf41838cf5e9e74f52cb69.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 5240 bytes
SHA-256: 3649868847ec2cc6edbdc31ca1482c157826d87865b0e8bad380ae8a4b05b9a0
font_01_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 11592 bytes
SHA-256: 2d13689ac0d940ac2c225f38e7e12f714d0d2ca4e2077d7d23dfd5a0934b81ea
font_02_sfnt_off00015447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15447 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34