Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4e362071e24edf…

MALICIOUS

PDF

85.1 KB Created: 2021-09-22 10:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a958f74f0d7f690e3b0f8234e9f6cd77 SHA-1: b097ec2764cac0c0f77ca11e5415fe86a19f8abb SHA-256: ac4e362071e24edfbd276248e74b0da0599fc611cd11cbbcd09fdf15af240651
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving redirection to malicious sites or the download of further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common technique for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+2+full+movie+123 PDF link annotation
    • http://chelseafoodmart.com/uploads/files/76486957156.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161419296079ef---jiwugepupemufotoxaxopulex.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/12645913648.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210901_5AECE9156B06A1E4.pdfIn PDF document text
    • https://goodline.by/userfiles/file/48916794951.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/72814555658.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/41740288545.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/womesimerigox.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/fudipaxabedi.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109150608295474.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/jamep.pdfIn PDF document text
    • http://czyxchem.com/upload/files/biforezebo.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/64158149287.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/2552621984.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/femararogojalube.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/vafolidumogefumukabab.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/iqeithr8c3rbs2irlftn20ofn5/mijafubagiwe.pdfIn PDF document text
    • https://iwistw.com/upload/files/webetawajisezovafo.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/28949044577.pdfIn PDF document text
    • https://dacola.com/upload/files/82027440244.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/79597247142.pdfIn PDF document text
    • https://carlojans.com/cms/file/woxopebovibaza.pdfIn PDF document text
    • https://partnermind.cz/images/files/71165470718.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://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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 11464 bytes
SHA-256: ecc7713c4acf05c355996ee423754573039da9110dfeaea22e938ac998dc9c55
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 18148 bytes
SHA-256: 2f41a0c237353b7a940abf6edb464def07fab7d445fdf4f13210150cdb0b12b4
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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