Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6281aa3ab7e75c…

MALICIOUS

PDF

67.5 KB Created: 2021-09-30 13:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c909e5f2402619408fd81acf1e2cc860 SHA-1: 21677940cfafbeeeae9b0df68823d898d5595380 SHA-256: 8f6281aa3ab7e75c051617a4bf13c84014e311b1751b7d150c6c2890396cb498
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical for tricking users into visiting external URLs. Multiple unknown URLs were extracted, suggesting a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://avigailpekelman.com/sites/default/files/file/lozokofukom.pdf In PDF document text
    • https://searchlink.org/userfiles/file/30726104579.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109182026038189.pdfIn PDF document text
    • http://signauction.net/userfiles/file/nijedetimu.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/wokidobelusulole.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/pukaxuziruxexonunuzupoj.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/11081087336.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/83872692176.pdfIn PDF document text
    • https://datajournonepal.org/files/dosepawig.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/xuberusigik.pdfIn PDF document text
    • http://yilip.net/userData/board/file/73815423099.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c193087853b5ff69a63ebb502df38d82/zogipinabim.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/13414145771.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/28966945845.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/bigopumuvuvorifujowoka.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/gokax.pdfIn PDF document text
    • https://dukupahit.com/contents/files/goxoluwasi.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20210926131926.pdfIn PDF document text
    • http://lqhuachen.com/uploadfile/file/2021092820133373499.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rovexegur.pdfIn PDF document text
    • https://satesayap.com/contents/files/zivutaxide.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/24015831190.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/medowagozixem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+i+move+apps+from+android+to+iphonePDF 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_off0000ace3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 14052 bytes
SHA-256: 6927c8775021f367897349d2544f5f2fbf027d8fc8f64c58ced0b3460a080449
font_02_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10812 bytes
SHA-256: a6068e6146e813798757db5fc739d30cb5f688b96a068b34533614c22a1b6e02

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