Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b202cd2cb0b6210…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 22:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87ce340fa921856a4c72bb0fa4992da3 SHA-1: 96bce695b7353f87da1c9faaf319b726cfda0b33 SHA-256: 6b202cd2cb0b621055952bee3d2ffc99f0b5714634dba2228d2bbf906832d705
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF phishing document by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a billing or security context. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=the+formation+of+a+positive+ion PDF link annotation
    • https://imaggu.com/ci/userfiles/files/95548922704.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/xunokivugosowesodezube.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/2681161218.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109130453298576.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/sikifubolutozi.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/38056758478.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/nutavoxawixagogoworakifop.pdfIn PDF document text
    • https://dptech.vn/uploads/files/84144679131.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/45994576162.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210901230110.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mafagibomuforaxafuxowik.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/11301330904.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/pugisogosuvazesika.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/10430391740.pdfIn PDF document text
    • https://latework.cz/soubory/68482494514.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/buposubidiseb.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/11288738636.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/46128506205.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vavepusonewipikejarawovep.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/tefofukebufujap.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/63213593624.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-12-07-07-56-rm8JlDBi.pdfIn PDF document text
    • http://netart.hu/userfiles/file/89250124302.pdfIn PDF document text
    • http://medica-brno.com/files/48083989683.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1a1ae13c---satexozotiz.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 10608 bytes
SHA-256: 6e94a52cadef06ce27809eace57441da0e78ca848522e67599e741791d43721e
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 19872 bytes
SHA-256: d5bc4f549475b702bd8ee0e691ddd394d9c7994a1ba77c087763e3bff8859c59