Malicious PDF — malware analysis report

Static analysis result for SHA-256 90432d80af536dbd…

MALICIOUS

PDF

72.1 KB Created: 2021-06-12 10:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81fcc7f0a4048b459cfd4c12652916f3 SHA-1: 68f6c65e042ae6e3170d1e0ba0423d2e84df100f SHA-256: 90432d80af536dbd09dd696fc36d76030fadb4e09effcf9f981029cecd07b014
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though partially corrupted, contains the phrase "Working fake card generator", indicating a potential lure for users. The presence of numerous external URIs and the ML classifier's high confidence score support the assessment of malicious intent.

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://ketchas.ru/pbw?utm_term=working+fake+card+generator PDF link annotation
    • https://xinogibujijinak.weebly.com/uploads/1/3/4/2/134235465/4976772.pdfIn PDF document text
    • https://limudetoruvuvo.weebly.com/uploads/1/3/4/8/134890021/7625915.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/sapogo.pdfIn PDF document text
    • https://vidixudex.weebly.com/uploads/1/3/4/7/134774160/fibomufuxiwovijuve.pdfIn PDF document text
    • https://xanusirotenil.weebly.com/uploads/1/3/1/4/131407364/c47d2b3fb.pdfIn PDF document text
    • https://zarokosa.weebly.com/uploads/1/3/5/3/135300057/bukemewo.pdfIn PDF document text
    • https://gipuwibozomaz.weebly.com/uploads/1/3/4/8/134891778/5987399.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/8883630.pdfIn PDF document text
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/5495987.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/potivilokuv_waloxotav_lapamepoxizawaf_golukikaven.pdfIn PDF document text
    • https://gugebizibepowe.weebly.com/uploads/1/3/4/3/134364706/gogexurofebilul-bepijagovuteno-wedig.pdfIn PDF document text
    • https://wirufaxiferid.weebly.com/uploads/1/3/4/5/134599318/e3cb819dc6.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/fofosebamo_kulid.pdfIn PDF document text
    • https://xadupokunarufi.weebly.com/uploads/1/3/2/7/132710624/nulugex-parob.pdfIn PDF document text
    • https://vesodadetuvi.weebly.com/uploads/1/3/2/7/132740638/1692105.pdfIn PDF document text
    • https://zefodikibaxamot.weebly.com/uploads/1/3/0/8/130814254/1228088.pdfIn PDF document text
    • https://rakimazigikan.weebly.com/uploads/1/3/2/3/132303322/pagemolimavoka.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/1906862.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/ff8568208.pdfIn PDF document text
    • https://mewerenazedesaf.weebly.com/uploads/1/3/4/8/134885553/1f0c16c12b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425316/diferencias_y_semejanzas_entre_los_gneros_literarios.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144561846/what_weight_is_68_kg_in_stones_and_pounds.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/w/file/fetch/144715389/unzip_apk_android_2.2.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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 5056 bytes
SHA-256: 503a79432a7791d25681aab2baff084dc2fabd11fcf65b31a234f055e052088f
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10052 bytes
SHA-256: bcda3a0e6109c81d8f5a4fed05c4c7a6b1a0286f291790dfd019a7078d4933d6