Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cdb2d78668affd…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 17:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e852f51f533303ec9ad8090322f41e7 SHA-1: 83309fcbddbe4e10408e661c3e63c341fa97a0b3 SHA-256: e3cdb2d78668affd71c9d7748e156bb483d1e4ebe124c0af3e8b847a57771207
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on disposable domains, designed to redirect users to potentially harmful content. The presence of numerous URLs, including one using an IP literal, suggests an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lnv-cnc.gr/userfiles/file/gitegodozuranujubikuwu.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614322e3e38bb---julegobuvot.pdfIn PDF document text
    • https://breedlife.com/upload/files/94828365735.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/nigagikamutajixasexiduva.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/61563938672.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/vikevonavilalidu.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zodufimiwag.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6e35c8d---zukesobironilibobilewos.pdfPDF link annotation
    • https://hw-power.com/uploads/ckfiles/files/61433ec9c31c3.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/4423518694.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/lerokeliwijofodudu.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/daxowomufovopidanabu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mowutajaj.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/29596379147.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/62659706838.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/7907270178.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613114c180afc---33153019682.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/lejiwatibavuvuzikipoxi.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemevareri.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nuvizixuzof.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nalubi.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/devuvotejepisadegejosola.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/nimavufa.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/b112ec48776e08098f5a7c8532cec544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fb+11+lite+apk+downloadPDF 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_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10464 bytes
SHA-256: 906b2cc04bc98ff1d0f3e896546930e38c64cab2eb1ea1a076b879eb4db8c4c6
font_02_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 20220 bytes
SHA-256: 61e5bf6f08422fec32ed0495336b215842d9c47b65b5d193bc8b85102815cb5e