Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cece7f0d6c2a354…

MALICIOUS

PDF

103.9 KB Created: 2021-04-06 20:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3802876f478987f2db712e40c7e4f726 SHA-1: 808703bca4bcbfadc0f528041c1a316b175260a6 SHA-256: 5cece7f0d6c2a35403a82d1027ab30039ab17d6db31a0650f0839f386724206e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to generate traffic or distribute malware. The primary URL, disguised as a trivia question, likely serves as the initial lure. While no scripts were directly extracted, the PDF structure and extensive link farm suggest it's part of a phishing or content-scraping operation, potentially leading to further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=what%2527s+the+hardest+trivia+question
    • http://juvovagesubo.mywebcommunity.org/3346557933.pdf
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/033621355b6fe4.pdf
    • http://jushq.club/zurondrmkg.pdf
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/2021634.pdf
    • http://gamukanemafutu.mywebcommunity.org/5062436138.pdf
    • https://telazeraba.weebly.com/uploads/1/3/4/7/134771299/6c904.pdf
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/9359728.pdf
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/8702912.pdf
    • http://rolazipomi.22web.org/49745229230.pdf
    • https://nokabukewodujam.weebly.com/uploads/1/3/0/9/130969525/lofapogifara_dadijas_bofebiji.pdf
    • http://fimewot.xyz/no_grain_no_pain_diet_reviewstev2t.pdf
    • http://wersita.fun/ematic_digital_converter_box_with_led_display_and_recording_capabilities_-_black_at103bdryed.pdf
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/xiruxejejibe.pdf
    • http://vorofagup.22web.org/canon_ae-_1_camera_instruction_manual.pdf
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/jefavanor-danijogijudagip-farabekutejabek.pdf
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/d71a7634a2c449.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fuvuvadut.onlinewebshop.net/19710000866.pdf
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_538a5bd9183242648d1582b937cb0dfb.pdf?index=true
    • http://kagejadel.epizy.com/hand_embroidery_designs_books.pdf
    • http://vavadot.onlinewebshop.net/anthropological_linguistics_an_introduction_william_foley.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_d49a1a4730334dc6b47e623c66d77ed9.pdf?index=true
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_96032f31ba0644a98a3d0661dde02bfe.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bc5.bin
b8748707cb024fd5eb75e8c444c509884abe4df5576d46509d34ab19168ffe3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC5 4996 bytes
font_01_sfnt_off00015cc5.bin
b53673676f5a1a5354da270c1becb62dcc9743089eb4c6b798b48fcac193b85e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC5 10912 bytes
font_02_sfnt_off00018201.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18201 4324 bytes