Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79a413ad5d8666d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 02:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16e845782cb8eaa2e3c83fd6461be9d4 SHA-1: 4fb72d437022cecdb3958816ca2927b60e34fd00 SHA-256: c79a413ad5d8666db98a9a0cf49673754873d16b790e11b175059fe82aba7853
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are flagged as disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=dropshipping+keyword+research PDF link annotation
    • http://bhk-aindling.de/userfiles/files/5505887442.pdfIn PDF document text
    • https://penzion-palice.cz/content/zodajixiliwigubudonag.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/62688342650.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunawoke.pdfIn PDF document text
    • http://vit-physio.de/file/86660177357.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///2298661720.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/97708445367.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/20466102128.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/fuzidakujafadi.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/jixopolozusakesakebid.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/ludanezoxizaxax.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/78ktsrmp6q2fl7f9r3a3vpm1n0/ziwuwasusosawadaza.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/tikigokasadidexi.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/47026253270.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401218b62ee---dekofesatezelagi.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zedowexulo.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pesewitekirewar.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/ranigaretanesakizele.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/8803753986.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/55759706647.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/nebadevuwagamulelu.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/fizeduteveximiwug.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_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 17472 bytes
SHA-256: b71f816ea7eaac70d3ce8e1803a67306fdb2ac6fbeeb258d1dbd5f6b5baf47e4
font_01_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10944 bytes
SHA-256: ae772b6d729c136118024e27656223cc87bdd2ab43e83a5453a414dea6dfeff3
font_02_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1