Malicious PDF — malware analysis report

Static analysis result for SHA-256 b744867f09519140…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b938abb3332843f8f023e722c90a49e7 SHA-1: 54fc54fe9778dbc292ba5a4317e383694abf3d61 SHA-256: b744867f0951914010cb30c0a1050c2d7b08da46df4dd21d6e505c974db5549b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-based interface with embedded JavaScript to redirect users to external URLs. The heuristic 'PDF_IMAGE_LURE' indicates a typical shape for a phishing lure where a screenshot hides a clickable button. The presence of embedded JavaScript, flagged by 'PDF_JS', suggests potential malicious scripting activity. Multiple unknown reputation URLs were extracted, indicating a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 68 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nrgmedia.hu/files/file/zafetepeda.pdf In PDF document text
    • http://ativn.com/upload/file/begipavuvijome.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/dusez.pdfIn PDF document text
    • https://labelmarket.pl/data/file/49248393208.pdfIn PDF document text
    • http://th-hl.com///upload/files/nosasoralamitavivin.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/f646ac5c6be6e4ecca9c5d0c13431f60.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/tulatunizekiru.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210926092242.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109062043131124.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/68628248218.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wakupivewoduwizubabomi.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/mupogusagono.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/wugejiwixuf.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8914373586490c6ec24d4b618039f678/40198482481.pdfIn PDF document text
    • https://nexusmediation.nl/files/getekanowawuxukujavo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/gowebiliwubikoze.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/75980978874.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/vivojopepowokebexomabos.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/64693109153.pdfIn PDF document text
    • http://kgmda.com/upload/files/divuzumibudix.pdfIn PDF document text
    • http://methese.com/upload/files/kitavajuba.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/7845033472.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/vumozalilugugu.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34446321381.pdfIn PDF document text
    • http://lagrupacio.cat/file/ruvawoloniwigerekad.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/49984881117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=h9tmail+sign+inPDF 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_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 14016 bytes
SHA-256: 47219318711458ab5d04f4cb235265d444670006b86bf056ef8fccbda58a66ef
font_02_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 10260 bytes
SHA-256: b05041eddcf96c2b3d54728ac2159f52886c7c86b7d6ddaa3ecbaf8630f9950c