Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d5cfa9a6f1fe5a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 16:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d7f27914cf6de7385dff5fc281999c SHA-1: 7cd122b35fed294084542dba2fe7cc13120aa297 SHA-256: 56d5cfa9a6f1fe5af6e85049de554e2c7c0308580af70866e3b467cc2f700323
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, employing a fake CAPTCHA to deceive users into executing further actions. It also contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The presence of a password archive lure indicates an attempt to bypass gateway security by encrypting a payload. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest malicious intent, likely involving the download of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://golowaki.ru/wix?keyword=paypal+account+generator+2020
    • http://kogutojoveso.mywebcommunity.org/manabiremujewulix.pdf
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/fepuwojolumubiwawiv.pdf
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/vaven.pdf
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/gunax-nimet-vujomad-lunudobisazikew.pdf
    • https://cdn.sqhk.co/dodiniwotud/ggjhpgf/ninja_fighter_full_movie.pdf
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/wereku.pdf
    • https://jitemino.weebly.com/uploads/1/3/0/9/130969659/8820469.pdf
    • http://dororuminaxa.mywebcommunity.org/continuity_equation_in_cylindrical_coordinates.pdf
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/tawosolufilobeba.pdf
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/07370.pdf
    • https://cdn.sqhk.co/lilodipu/b3idzfM/61442220533.pdf
    • http://kagaromorin.medianewsonline.com/bestiario_hp_lovecraft.pdf
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/lilamupuwo.pdf
    • http://pixunune.sportsontheweb.net/dipivixudekoziriderejinum.pdf
    • http://pubofumoxo.scienceontheweb.net/31863244509.pdf
    • https://cdn.sqhk.co/gewewoturila/hcUNhif/garageband_ios_review.pdf
    • https://kotugupevexaxis.weebly.com/uploads/1/3/4/4/134493549/0c3d31477b673d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divikufifir/learnsmart_answers_history.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_44920b345a944b389134850c1763d9a3.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_b082cb01e9624d80bd2a2621b398ca1a.pdf?index=true
    • https://s3.amazonaws.com/farezelof/18795622839.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_1a003923bd334a2893d701c7f8915456.pdf?index=true
    • https://s3.amazonaws.com/divexikav/avery_label_templates_for_indesign_mac.pdf
    • https://s3.amazonaws.com/faluzotixupi/sinhala_adara_wadan_images.pdf
    • https://s3.amazonaws.com/nuruvapozixix/kinetic_molecular_theory_chemistry_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3b.bin
2feef21670d7583e17d14fe7e8bf152a0a161a39f9d1398a7a668c7601db7431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 5300 bytes
font_01_sfnt_off0001005d.bin
00819961874b8017ed9fcc90c5186594ba4dde1b5d8adefb1a1536c999609046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10204 bytes

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