Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8ab3a5c4f55517…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 06:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da7a6b4fd3ea6921fd84172df78fe702 SHA-1: e513c6c9d6f0519349b984e2a5021f71995b571e SHA-256: 8a8ab3a5c4f55517cf13436896d74f1f7965008e6c0c3a303f2a25e7e5b2eedf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=draw+on+screenshot+android PDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/56a0042c00bf875f99bc4b58d190d988/9271501759.pdfIn PDF document text
    • http://espwireless.net/uploads/file/suzikejat.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/lobojigagagibud.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/1099675420.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/92790359059.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/64693109153.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/wumef.pdfIn PDF document text
    • http://195exim.com/datas/files/24136885673.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/63473391737.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/52543022036.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/86264366096.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/33000102646.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/98486479590.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/9184669611.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/voxivotigodaros.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/24596905494.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zubezajerusimutiwo.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_off0000c0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 17260 bytes
SHA-256: 42051850da7c0b9a2830ffedca9caca9c2a0bd64ef1f47ff836c5068cb37703e
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10508 bytes
SHA-256: 3506fa20cd278114ab109ecb14116787616a96fa01618fb3b4975c3eaacaa673

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