Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50ed7fee3235d7c…

MALICIOUS

PDF

67.6 KB Created: 2021-09-17 20:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59d96d11d59f0fb1d7efc0b2df811c48 SHA-1: 859c732cabafbbdcb89d0ee6e5677cb9d03d95e8 SHA-256: c50ed7fee3235d7c98d9b3cf891e5934e8d315af28cb19207191830e25d193f1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded URI pointing to a suspicious domain, and numerous other URLs were extracted, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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://ketchas.ru/uplcv?utm_term=private+instagram+viewer+legit PDF link annotation
    • https://nguoixunghekiev.vn/userfiles/file/3957271065.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/guronejowexazotewiboli.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/47651224008.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/nesoduze.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/jufuziwegonivita.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/tudururibiwofowovumoma.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/20444988572.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/24912993783.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/digikodifugomovug.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/butamapabudatu.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/23149888541.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/94198865034.pdfIn PDF document text
    • http://kahasat.cz/data/file/getinediguvafebepero.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/saluxudarikedo.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/megarakumalupufixumapog.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a16d79140---12419528380.pdfIn PDF document text
    • http://cahayamimpi1.com/contents/files/75500528694.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_01B0A5740CBEE80B.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54441676551.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/kitanedomezesixosapi.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/84737385582.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_off0000aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB1 10484 bytes
SHA-256: 899db997a40e89fa7224fac0eb0fdb418c5cf374f69a73d5e59aacc36f150cea
font_01_sfnt_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 13988 bytes
SHA-256: 90cf7fb41c2a3952bf336cb418768dc5285dd41e03df4f718be306896c535b0e
font_02_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.