Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b56cc2503183eb…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 23:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa6be5c66c1d34c652116561b84510b5 SHA-1: d0fa12512a79c0551242c8227f4e0e06102896bd SHA-256: 88b56cc2503183ebd95a1814cc2e2cc3272c3a39cd8ac98e1d41d0d880ccdf1c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous embedded URLs, suggesting a phishing or malware distribution attempt. Although no specific script was extracted, the presence of many external links points towards a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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://democv.associasuite.com/imagenes/contenidos/files/1474471431.pdf In PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/nagitexojipabizekurosux.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tatiwidedirovirinubelareg.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/61037222031.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/dekonoxepibolufujiduvut.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/74748782222.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/83823565812.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/80755503467.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/dipijetopud.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pazozusajuxomifuna.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/23311591653.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/43145064300.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/7079031448.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/81256630780.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37428834440.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/nemofer.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l0ihchl3i08ijqnpm14vh67e34/53725980434.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/losililamusud.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/dusuvin.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/98643707692.pdfIn PDF document text
    • http://kezmosas.hu/files/file/nojonimeveg.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///16285542681.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/47836391406.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/9040153112.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/tuzad.pdfIn PDF document text
    • https://kawanmto.com/contents/files/29663203464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+power+of+habit+filetype+pdfPDF link annotation
    • 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://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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 10624 bytes
SHA-256: 4ddac1a1dcf46728a058805b1fbffc01729c443154a334f0d4d439979a9e63d7
font_01_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 14908 bytes
SHA-256: 3b04e33703a97774dc14967f8d0a0581c553f161b1db11ca42ccbfc15c6d4c5b
font_02_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1