Malicious PDF — malware analysis report

Static analysis result for SHA-256 268a68f279865c09…

MALICIOUS

PDF

85.1 KB Created: 2021-09-24 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11156064117c0f7f45375a524ee77ec0 SHA-1: 8b3472367f30de46201d739887490a65c8be15a3 SHA-256: 268a68f279865c0928ba89d069e2fdaab181c05af84d76f03834e3009cb02f6b
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of external URIs and a link farm on disposable hosting suggests a phishing or malware distribution scheme. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick the user into executing a command, potentially to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=minecraft+launcher+for+android PDF link annotation
    • https://hmanagement.net/userfiles/file/lokuxipapafelavixuwakakug.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/ropezubolifawesifekediw.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161350fdd1f875---75517679495.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/jixezevamodasijad.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/61986535112.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/buxoravofeko.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/kadesuvozavawabisosamav.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/dujafub.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912120313.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/90946699694.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/31759319942.pdfIn PDF document text
    • https://jin-ji.com/upload/files/xonenuboxokirixolozenogu.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/52510677535.pdfIn PDF document text
    • https://hiroyoung.com/data/files/doxuzudeb.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/bajopomawip.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/dizipikexelabololadazojaw.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/dekonoxepibolufujiduvut.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/xedazikeguxapovi.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/79582227273.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394c9b80722---8438414816.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/rinonowu.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/34282108750.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/tijulutevopuwovagipija.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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 18040 bytes
SHA-256: 3400330f266b851e30f64e9a312b30ab553b7ba36cc6a1630cdd038dd9fc4dda
font_01_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 10500 bytes
SHA-256: c9925a9165e1da5a6c40f0adbd3dfd8f82c2f523ca978939335440e04fd5257c