Malicious PDF — malware analysis report

Static analysis result for SHA-256 5711cf4bbed29ce7…

MALICIOUS

PDF

92.0 KB Created: 2020-11-23 23:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b1e625d80631a7d2af54d77eda3180fb SHA-1: bd74002b608e33b88c742733fe167352cc43397b SHA-256: 5711cf4bbed29ce79de170c411a9c480be4d60a8b2d393d1b85bbec17c476aa5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely contains instructions to download a password-protected file, a common tactic to evade gateway scanning. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a phishing or credential harvesting attempt.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/strik?utm_term=volver+con+ella+andres+cazares+pdf+g PDF link annotation
    • https://nuvofuvulaxak.weebly.com/uploads/1/3/4/6/134694516/dirubuna-paxol.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/4307635.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/nizuleto_jatexivomisurus_kapuwan.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/9244098.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/danuga.pdfIn PDF document text
    • https://koxokigibobov.weebly.com/uploads/1/3/4/6/134600250/bimuk-xufibuwogefa-dumalize.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/d1baac35a1d26.pdfIn PDF document text
    • https://xigodawi.weebly.com/uploads/1/3/4/4/134464905/limokesopomuv_jenedirotite_wavivutawumoter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_5fb94716c205f.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
    • https://s3.amazonaws.com/gifojuxaxeva/lefupunazerubu.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/xizewiponasufafi.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/can_t_find_amazon_order_history_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/league_of_legends_tft_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/mitchell_county_nc_schools_facebook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 5056 bytes
SHA-256: ac7c6df82e95e327fb30027d135cb9126f24f82e66d4e766b10f4228dc5dc0d2
font_01_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 12508 bytes
SHA-256: 7aefef07e4c697c9e59137926727ad3ce6edc7a3c636ffbce0ae9a8878874731
font_02_sfnt_off000152bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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