Malicious PDF — malware analysis report

Static analysis result for SHA-256 6337a6ebbdfa83a9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 23:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6c1f2507777afd2905f257ed52395ea6 SHA-1: 5db961c2b8baa1960f3279cd994d0e42987d5ed5 SHA-256: 6337a6ebbdfa83a9a66991d98fbceaea1e95247c8237f04d9faab517c4d06c59
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to attract traffic. The embedded URL 'https://resalured.ru/award?keyword=download+buku+akuntansi+manajemen+rudianto+pdf' indicates a lure related to downloading specific PDF content. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/award?keyword=download+buku+akuntansi+manajemen+rudianto+pdf PDF link annotation
    • http://kinoxca.xyz/mosebepigikuxofi0uhmi.pdfIn PDF document text
    • http://indital.space/sabirexopajotofojujodafuwdoqxc.pdfIn PDF document text
    • https://tupobufilu.weebly.com/uploads/1/3/5/3/135310482/ziluf.pdfIn PDF document text
    • http://mavito.online/vunonaguribisesilujmh333.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/8b0181b.pdfIn PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/gateguwo.pdfIn PDF document text
    • http://itabody.space/chinese_learning_beginnerwft58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6036ad1aea239.pdfIn PDF document text
    • http://socialwave.me/relative_clauses_worksheet_british_councilfoo94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_600337d53db31.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/feforaze_maruwafunopefa.pdfIn PDF document text
    • http://qwertyujg.xyz/are_potatoes_good_for_liver_cirrhosishz2nf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5ff173226a8b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5ed4d7-a7d4-404f-93a4-c4b56b288902/game_sequels_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb986435-ef6c-421c-ad66-922c565052fc/pudoguwikavudevuburumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f7affb-b6ca-4f7e-a501-4e36a5dcf018/can_you_succeed_with_adhd.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/luxusaxikikazezil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3521c4-664f-4e7e-ba6e-d369754d3bd8/xijujukewikevukobo.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/66339859196.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/ibm_spss_amos_24_user_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/kevaxarepisivixubitelis.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/subawisaganoruze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5558b648-0a44-4dba-9de7-e427343bffb6/20148067001.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 5560 bytes
SHA-256: db831c6d905a4bbb12721f4d10a712c3180b232ba1492bff0ee2a3e0e4b2b683
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 7216 bytes
SHA-256: db26bf8de3322bfae9c1bcc12c8d396792d4e5e0bb6dd9f776e641404cfbc0d4
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10728 bytes
SHA-256: 571fc84281eed02efd4e3590c6f5723829d1eaf8993bc95d2ce7dfcaf2af490e