Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce2a392e7114226…

MALICIOUS

PDF

76.6 KB Created: 2021-09-23 15:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94637235537b11f390b1333ea8ca8ea0 SHA-1: 5bb48946f58967a70fff8bf4ba0bb656f803816c SHA-256: dce2a392e71142267a666e1620c9d2c40f35798a1be0142d55a762b1ccaf04de
146 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a phone number. While no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites or initiate fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketdoanbus.com/webroot/img/files/donuninofoleler.pdf In PDF document text
    • http://egitara.com/upfiles/files/63706629061.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/72212763964.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/11612199047.pdfIn PDF document text
    • https://limsurdua.com/contents/files/visukixowufapaviduvun.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/52673942632.pdfIn PDF document text
    • http://hidropro.hu/upload/warazaxa.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/23328006062.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vovunapemibegeriladivib.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/texexej.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wuwujugozi.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/jajipaxavifoxutudim.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65817304461.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/92851981172.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/50230453413.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/nifaru.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210914173547.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/xawulobepazove.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/12804037434.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/59714085717.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/87312110766.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338813bc926---98792059360.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/14649323386.pdfIn PDF document text
    • https://webmenuplus.com/images/file/47345488490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gaming+dark+apk+downloadPDF 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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 17560 bytes
SHA-256: f1a7678f954762703a3eb93be7c2715d4daeb28a35aba2f2dfe5f5a82e59d0d5
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10552 bytes
SHA-256: c5aa0bc4dc8c63730a0f23643f9f4329b47399adb8409b3cae9b4063865474a3
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1