Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e8ca00c7287f4…

MALICIOUS

PDF

76.1 KB Created: 2021-04-23 21:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7a613a7a7a2f7623af4f42e38bc76ef SHA-1: 7833660d135db9ba65351974f981973c7b76e386 SHA-256: b55e8ca00c7287f425a73794c052d237c62c8ed48c600ff2f5a4928a307e2604
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=cuales+son+las+verduras+que+debe+comer+un+diabetico
    • https://static.s123-cdn-static.com/uploads/4418567/normal_60044f41db657.pdf
    • https://cdn.sqhk.co/girewobo/DIjjMic/squad_vs_zombies_game_online_free.pdf
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/842453.pdf
    • https://cdn.sqhk.co/wubunepan/4jbhhhe/25273246667.pdf
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/1529845.pdf
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/019e2a24.pdf
    • https://static.s123-cdn-static.com/uploads/4455886/normal_5fcaaec43746d.pdf
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/432a497392e28.pdf
    • https://cdn-cms.f-static.net/uploads/4420756/normal_605bef8393d00.pdf
    • https://cdn.sqhk.co/nuzinipaz/jfPgjjc/game_keyboard_apkhouse_apkhere.pdf
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/5207794.pdf
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/f22c3e2eb.pdf
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/rabusiki_zorovegoj_viselupir_kubutuw.pdf
    • http://5gusevshop.space/36442311218flv5a.pdf
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/fixupuwiloxobilol.pdf
    • http://fullstacket.online/deductive_logic_warren_goldfarb610yb.pdf
    • https://cdn.sqhk.co/tinipuded/LWhhLha/easy_movie_quiz_questions_uk.pdf
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/5837343.pdf
    • http://fionainthefield.org/rulugonitakepizigykcn.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_604d89e8ebd8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e8a9.bin
42004439aad8d7caff2d241cf8bccf7d3ff4737e1c32081d132df3aa47c22269		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5316 bytes
font_01_sfnt_off0000faa2.bin
db8ca22fb3b5ad0866dd8135a815ffc77b2ebac719cb39eb74f4f2ffb1e812a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 11748 bytes

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