Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b19493fc4ead3d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 22:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a1169e03bd424d5c50e03830203cf6a SHA-1: 9300eca2a1b805417e07de6f7a1b4785859bc041 SHA-256: 09b19493fc4ead3dfb151c23261831fcfde03ebf21967dd07f50a025808c72ec
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a single image designed to act as a lure, with clickable elements directing users to external URLs. The document body is heavily obfuscated, but the presence of numerous external links and the 'PDF_IMAGE_LURE' heuristic indicate a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 2 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.
  • 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://huntic.ru/uplcv?utm_term=blokada+android+tv PDF link annotation
    • http://kmbb.at/userfiles/file/50974347526.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/wazikumojukudem.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/lasedunonen.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbb5d9075---91373263505.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zepifosifukemoz.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912175627295219.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/kilepudu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/79286728296.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/12546207183.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/22215490847.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/37713512640.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138bef7e1c36---25972746555.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99792638787.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/bupomekuxowebikamefuz.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632093266.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/luvosukedunowerivazazo.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/83723639461.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/miwuruwukoluwajawezi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/10724183051.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/rogipozuzexevufibaziti.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/47010580080.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/vadegugu.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/56243543563.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/73516775603.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_off0000b353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6A 10152 bytes
SHA-256: 5d6a64b234ae54e5027ca1ac7bbdf2f3711365385edc0416f92a65d3c58e21dd
font_02_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 14328 bytes
SHA-256: 644e3353c9b58d14ea7190cd6120767edfd72f7926e17e34cdb0f7844133f11e