Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e6d044affc5e61…

MALICIOUS

PDF

84.4 KB Created: 2021-05-05 18:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 572d9c7249801f825eb20297458defb5 SHA-1: b4b3ecdd646139ed6b9c980087d8147862fb1dd4 SHA-256: 27e6d044affc5e618229328a8002d686cb90334b88992567416b2e1b07fbee88
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains text related to guitar lessons, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=clases+de+guitarra+gratis+para+principiantes+acustica PDF link annotation
    • http://zofoxexizoviro.iblogger.org/calendario_feriado_puerto_rico_2020.pdfIn PDF document text
    • https://gegefajowib.weebly.com/uploads/1/3/1/3/131380265/nipizinefupabomevopi.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/3956742.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/gurewebafa_wovar_gajamugado_tuginixi.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/jafizazevovewo-felisom-lebezofu-rutuvili.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/gjhbijK/guess_the_emoji_trivia_and_guessing_game.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/zukidobanar.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/u1Q6jfC/37105441133.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/igagckl/3403922056.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/108fbb0b.pdfIn PDF document text
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/461bd5a2616.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/gkhf1U3/vorikemujesubev.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/cPicJha/space_for_life_garden_rooms.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/jSgcG90/minecraft_jurassic_world_download_failed.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/jcihgjc/97063517558.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/sCCgjfV/verekiji.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/d6cEiji/momefewena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/joterige/baby_grand_piano_yamaha.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/bienes_y_servicios_ambientales.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/bosch_300_series_dishwasher_shem63w55n_manual.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/tamil_nadu_open_university_books.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 5144 bytes
SHA-256: 056506d963262208cfed6c33864483b418f27d3c6f956b56561a87de7fdb19c2
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 12588 bytes
SHA-256: f23dd9417ffb5f1c090b91302e8864616daad99e7f020f19c7a0760a4eb9e8d2
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd