Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19ba66516deddcc…

MALICIOUS

PDF

66.8 KB Created: 2021-09-28 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45a808ea3583da2240eedacf785447b9 SHA-1: 646f967ac124ba1ffd8d5247cf7c5c9308368772 SHA-256: e19ba66516deddcc719cc66f5ebd85e053eb219145a36c2da72f0febb71a46ff
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its small size and image-heavy content. It contains numerous embedded URLs, with 'https://inwebjor.ru/uplcv?utm_term=strongest+hero+in+mobile+legends+bang+bang' being a prominent example, suggesting a redirection to a malicious site. The document's structure and heuristic firings strongly indicate it's designed to trick users into clicking external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 66 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://inwebjor.ru/uplcv?utm_term=strongest+hero+in+mobile+legends+bang+bang PDF link annotation
    • https://myarchitect.es/ckfinder/userfiles/files/31238846209.pdfIn PDF document text
    • https://theipbuzz.com/images/file/67125810542.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/gogofamelaw.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/bapezorazafosolagider.pdfIn PDF document text
    • http://iviltra.lt/images/files/lepezilafawulalaw.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/reradenofixokavunojuxife.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/gapefuzizosivexabapan.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/38883449888.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134256e87abd---28561281588.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336605dc021---86353132161.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/2911586277.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/pipowerak.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210927122114872.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/somijig.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/46828702475.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/25917539996.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/33947161978.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/51197577349.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210921072058.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/78400569793.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_off0000aa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27F 10908 bytes
SHA-256: 3a5a976a36325c7bbee08bf9ce34aa07b60cc0fba52df0b66a280e8f110bab7b
font_02_sfnt_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 13912 bytes
SHA-256: 950783e0fda534867d0c54ba64f18c36e8d235eae0f2b2f48f9bd970b54d07ac