Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e36b8725350d472…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 01:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 229d54ed8166fc07af34d6205405c966 SHA-1: 66651d30bf4e729916298f61a21fdf02b2491f48 SHA-256: 1e36b8725350d472d4d4e8b58ada71f60edd5d29b854bed9c2bf407b5c829f37
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs, one of which is a link farm designed to redirect to other PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic for evading gateway security. No scripts were extracted, but the presence of external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://80tner.netsociality.com/upload/files/dabulavekevukewuxuxuvebe.pdf In PDF document text
    • http://frangarcia.eu/upload/file/jivane.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/mobexesitudujirodog.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/roxatojo.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/18190348928.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/53107603866.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/sebekovanironizefok.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/62351879446.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/66788120608.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/wajitopukofawuloxujuxavu.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/vufinotipo.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/gedel.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/bikoserezozararugezoma.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/73766902190.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/41168639487.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/gapusifod.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa5f6f307---xinijolirok.pdfIn PDF document text
    • https://webrobogo.hu/kepek/40006372514.pdfIn PDF document text
    • https://rm-parketi.si/uploads/niros.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/buganomex.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/diwusozejupo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa2e8f56e---90139554661.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/konujubasuru.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hi96ehb80cahq94a5hemu2uusj/53408019103.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lalixenidekiwuvo.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/xirilag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=login+office+2016PDF 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_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 16936 bytes
SHA-256: 0654480cf4a96ec127721d7e28a50580fa87ffc6c0171ec8e05dc499000ea7ed
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10356 bytes
SHA-256: 2e63b6eaf03a379c97117ba3ba506962fa8cca975b792023aae1bc91773b30e3
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1