Malicious PDF — malware analysis report

Static analysis result for SHA-256 9160280b041130cc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 05:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5e88279de734d07ed8f1ca065e3aff7 SHA-1: 287a5fe468fd5982c6168310e4f8c5c6aa8cadc3 SHA-256: 9160280b041130cc227ab3ccd0fa04766f9048e3408656c79b34fc9ee9c43218
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. Heuristics indicate the presence of external URIs and a link farm on disposable hosting, suggesting a lure to a malicious site. The document also contains visual cues like a download button and urgency language to trick the user into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://philabc.ru/uplcv?utm_term=watch+bajirao+mastani+online+free+123movies PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d90866527---xopidixak.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/joliribugamexutod.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/pinadofa.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zafusevakazorazatinom.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/pajawelatidofukigixolov.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163113553490.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/70988061679.pdfIn PDF document text
    • http://koddous.com/userfiles/file/bifutevarij.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/limipekekovapuk.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dv55urnbbljjdjn49u79jq30i0/93966153625.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/kekafi.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vipadejogo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/30680039883.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/vofekegipularoxunofab.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/nilufijavidujujiv.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/godemudezapimigiroge.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/migajusigujoxake.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/juxixibavamoxap.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/bavatojanadip.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/64785488146.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zufakumemobobosewo.pdfIn PDF document text
    • http://unibox.lv/files/text/36947611697.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_off0000b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C9 11276 bytes
SHA-256: 64e2bbc3332924420dec44a91da32f28684cdb858c293b4238d9f3a40c335fa9
font_01_sfnt_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 16780 bytes
SHA-256: 50f0dbb758c91a746706f02cf1808a627b2956909ce0ddb416aeffb12c4e7d07
font_02_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1