Malicious PDF — malware analysis report

Static analysis result for SHA-256 5174b9289d23d90f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-22 10:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcc63189656f8a7314b78449f82f4b4c SHA-1: 5487b616d12500109006d25972a634e1eeef62e3 SHA-256: 5174b9289d23d90f305c837d02f5c2f811fc56449f6393f11f470fcf7a638a04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely exploiting a vulnerability or luring them into a phishing trap.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://forglass.sk/userfiles/file/dewagezaxaf.pdf In PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/gubudebapufefepijogi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hr12ef83rk5st5jkq57qbl4k86/wojififilanojadaxuwaxot.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/173522632.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/98107664163.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/9740363748.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/vexirarukovarodorurumib.pdfIn PDF document text
    • http://health-bridge.in/upload/file/temozamezimupazovisu.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/sojigavokipudafazatag.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/siluxoxobi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/dawakadevodenepo.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/58369617233.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/2256166807.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5457886d5213886c73808e3db158f4d9/32887162379.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/suruwuwokusifekutupefab.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/gelitafakafejodas.pdfIn PDF document text
    • https://pecintajp.com/contents/files/gotetozemajozemak.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/63074948033.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/72183303973.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/85086404562.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dasowubegisovurajoz.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/239532164.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/misowokibo.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/pojenu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jiwigonimafafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=upcoming+smartphones+of+samsung+in+indiaPDF 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_off0000c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 11128 bytes
SHA-256: fa4ad4833d9e030813099a5969850b80c2b231e06d1210a9a378705052119b05
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 17248 bytes
SHA-256: 616f40cc4ba256b82bc5fb34b2858d7929cd6c3e9a851c69dce9b7bd6a3e4137
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1