Malicious PDF — malware analysis report

Static analysis result for SHA-256 a326b33e94fb4ff9…

MALICIOUS

PDF

81.9 KB Created: 2021-05-13 18:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca01d158dca7f80c9a395ab2e11d1c48 SHA-1: 5bdf2c4ff94ee929497c7b069fd3fbdad8b5128c SHA-256: a326b33e94fb4ff9179202453ad76a5f2e8e9671ed0bd9c01f2e27194a2f5046
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, designed to redirect users to various content, including potentially malicious sites like 'nipisod.ru'. The document body, though heavily garbled, suggests a lure related to children's guitar lessons, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=clases+de+guitarra+para+ni%25C3%25B1os+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415740/normal_60349a92740a5.pdfIn PDF document text
    • http://businesslinecenter.com/57826908128litji.pdfIn PDF document text
    • http://mobapur.iblogger.org/12906967254.pdfIn PDF document text
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/4571958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374362/normal_5ffbbf334a47d.pdfIn PDF document text
    • http://wownatural.fun/tidiputepobikavitoycq3p.pdfIn PDF document text
    • http://smotrikino.fun/toro_brand_reviewu3k8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_606e5992f12ce.pdfIn PDF document text
    • https://goxezojukaruvuk.weebly.com/uploads/1/3/4/0/134000107/7928873.pdfIn PDF document text
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/figabi.pdfIn PDF document text
    • http://virnet77.ru/ta_fidelite_est_grandee91op.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_6031237f52366.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/5b6e963d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_af8184eaa7754c75b5e9eea6135ceebc.pdf?index=trueIn PDF document text
    • http://sisizovomejefi.epizy.com/call_me_by_your_name_movie_poster_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/instagram_tanpa_play_store.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_2dd4bde359054e6c8b05e569159f99b8.pdf?index=trueIn PDF document text
    • http://pexivakerofus.rf.gd/oxford_collocation_in_use.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_6639dad71c454620bbb59f642f62dcba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/the_stanley_hotel_bear_in_lobby.pdfIn PDF document text
    • http://depegiwisa.epizy.com/powipujipijunax.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/26603892891.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_466568834b894eb5b510195ea5073cca.pdf?index=trueIn 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_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 5396 bytes
SHA-256: 39cb3d983f068df8240b45016e89b4e54765879b8087af5e95005cad698c8ee7
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 13008 bytes
SHA-256: 13220767005aaf181f46560318990612975692a234bd77ffa36ed5ed18f1a9b6