Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac8299b3f6fdeaf…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 03:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eedc13f51eb882a98e4c5622af03b898 SHA-1: f284592b39f570b5ae17c1ea4ff01c3ca6bbfeca SHA-256: 8ac8299b3f6fdeaf41dd5b80ae2b5eb4445be2ff024b467acd548460fbbbfb2f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=host+android+app+on+play+store PDF link annotation
    • http://sahcarpets.com/userfiles/file/15937300955.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/68271660122.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/vegorulajusiwob.pdfIn PDF document text
    • http://metall-press.ru/files/48164087436.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/zelozupude.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c630189---madeju.pdfIn PDF document text
    • https://nexapos.com/upload/files/40711356259.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/fevoxofutoduwijem.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/51523807766.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632606660.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/rikisuzadutudovanokili.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350681c8f31---78994780221.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/bedatokageximu.pdfIn PDF document text
    • https://viettrungson.com/media/Files/51043693273.pdfIn PDF document text
    • http://snft.ro/media/file/gugimaxa.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/45139530904.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/56640532597.pdfIn PDF document text
    • http://fxlcd.com/upload/file/24795415934.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/60890760825.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/fimoxoranedururemijurav.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a199cdc6c427b458be57a723b8fe94d8/37891586241.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/muzubo.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/relekalugumefisavit.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/luzexoxilep.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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 10488 bytes
SHA-256: a2914e25a3dce1da15ce8171893c0c7abc1f0ba23e0b61256e292e4cf246676f
font_01_sfnt_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 13896 bytes
SHA-256: 915a36ecb5f5122d8b7f47c7ae57b4534327e33e806e1673dd4d45a884024d09