Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6589a33ac31da6…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 02:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e0bf05a74d769e6a64431464d7d41e8 SHA-1: 338a0b64fef80d00ffd2a41461b4c42d59fb911d SHA-256: 1b6589a33ac31da67016719b9b76f2f04b3d8902506b0cf462720eb1153ca554
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is identified as a phishing lure by multiple heuristics, including an image-only document with an action trigger. The ML classifier and ClamAV also flagged it as malicious. The document likely attempts to redirect users to malicious sites via the embedded links, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://micsys.in/userfiles/file/98337518931.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/99399200199.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43931360272.pdfIn PDF document text
    • http://orem.mn/uploads/files/48012252136.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/22355386063.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/31976166553.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/952311445.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/winivadalepidudutane.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/badop.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/56344900113.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16132ada0a5f31---fuwilukif.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/rokepuxilorububawa.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/63558137298.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910205031.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/bubuziwibu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/83787633944.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3a10svlr7qdfpi7jv8183bc746/12949720642.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/47134502438.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/rafewuxalifusirefon.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210905145258.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/1143937655.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xerukirizogidojuxe.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091602323073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=treatment+for+paranoia+and+delusionsPDF 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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 14364 bytes
SHA-256: ce91f9c553946c51c1e8158ed74360dae85f556fbf1eeb82566a679485047e96
font_02_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 10720 bytes
SHA-256: 8aae0350aa525a5aaaf76fe3830efc8ec80f16a2a8717809c0336d562534c5b5