Malicious PDF — malware analysis report

Static analysis result for SHA-256 9993eb8fad5f53a6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 21:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e581539f404b20799f16e24d56b867b7 SHA-1: cd591ff4598fc1206dc9a1bd92ea1f44b81fd0a9 SHA-256: 9993eb8fad5f53a66d8eb752ea44ac25eac204a8e6dde21a9a33c6bb04e70dc4
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to an IP address, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://lnhaihui.com/userfiles/file/20210906061212_1147106429.pdf In PDF document text
    • http://dywin.com/uploadfile/files/duwil.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/35235433534.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/22062428915.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/pawabutibituvufi.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/wotupotawisabebizagutus.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/fokaromupi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/nizadubozetozenol.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210904160420.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/vudozifinira.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sapaluviposu.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/97108648812.pdfIn PDF document text
    • https://dm288.com/slicice/file/41606850918.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5dac8917e---napokuworopetavele.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/50670931293.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/xevug.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/58380851477.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/zawetatodurexujo.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/ziwojujatasaremegaf.pdfPDF link annotation
    • https://cuatudongbinhduong.net/uploads/files/48080034673.pdfIn PDF document text
    • https://riwg.in/userfiles/file/5061684155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=adults+in+the+room+streamPDF 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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 16752 bytes
SHA-256: fd869dea458b9226c938dba1e4f126620aeee3314c908e35040589e1755213b4
font_02_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 10596 bytes
SHA-256: f048638c3d4935e5e4a95735380bab98990e1b2e22835674f8b2ae8f8ef7342e