Malicious PDF — malware analysis report

Static analysis result for SHA-256 2908fc7b1e4d1e23…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8d78a3617658428b10d69e76c2605cf SHA-1: 00547ddd298f81454bbdb816968b97dfbb35b946 SHA-256: 2908fc7b1e4d1e23f92e891fc10bd56b871f0183f0a29879a782d844d68cf283
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555.003 Credentials from Password Stores

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. The presence of numerous external links, many pointing to PDF files on disposable hosting, further supports a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://logicparcel.net/uploadsEditorfile/likefoxefaluvorezezexej.pdf In PDF document text
    • http://hainescentreasia.com/images/file/83694197982.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/doladega.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6jf3elbcjrh3ngm9khji5rshno/7905465271.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/savedupaniduviz.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/rizovituzivepopuwimeg.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xizelato.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/pusasaralupax.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tetirotijumam.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/xerubemo.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/wuwugaxovapufize.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f38976eacf22f53b6cefcf3d09b185e7/vubenijaxubodi.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/ziwen.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/88154839750.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/68394604835.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/54208144355.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/vebafexefegugixefiwu.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/22926575727.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/691469247.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/84491730479.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/zigubefijugewevekonediv.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/xakomodipidixisejof.pdfIn PDF document text
    • http://billsky.ee/files/file/83701142658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=photo+background+editor+app+download+for+pcPDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 17168 bytes
SHA-256: e25ed22cf6678674fc76e21dfc9cf4dbd1f3911e5947d2aa8c45294837d8de68
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 11148 bytes
SHA-256: 53026311f0c5336a87bbf61c1ca6332db43cca10564e8ea196defc98fead3f2b