Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bec6e29ad087357…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 22:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a85344d9a56750bf10549b9293d3fb7 SHA-1: 8a074ecc95a3a558de5116b2ba06637c214590ea SHA-256: 8bec6e29ad087357bf05fd95ef86a3bf4cdee12ef5daf995d2947e63902c3ebd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is part of a link farm designed to host malicious content, specifically pointing to other PDFs. The presence of a 'download button' heuristic further suggests a lure to download a secondary payload. While no scripts were directly extracted, the PDF structure and external links strongly indicate a phishing or malware distribution attempt, likely via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theeultimatenetworker.com/ckfinder/userfiles/files/79935980329.pdf In PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/givewasabewik.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/74432625229.pdfIn PDF document text
    • https://ijp2.com/contents/files/nujazufolubekuj.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/datujoxajuxonom.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/56882884174.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/fuzax.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/9957726959.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/tedorabolijodabozife.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/95920475625.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/17270843407.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/59883948324.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/18646405020.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pisovulifinomubapitovatub.pdfIn PDF document text
    • http://brlairport.com/images/file/51113612907.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109040242307813.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/buxaki.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/farurovejumonewob.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210906130334.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/33933859017.pdfIn PDF document text
    • https://sopkambing.com/contents/files/47786981608.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/pusobonurodusigabinewev.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/76657981088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cheat+climb+racingPDF 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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 18280 bytes
SHA-256: d55e38ab395b5f282f9213ef21902e0e2cf5d816318dc7b77ac4f56f8ee22ed1
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 10560 bytes
SHA-256: 4ebf3df7f727b641e70af01e6d3eb102239505fd0ae164a32c32a5e3a9f12a63