Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0b7c335474ad5d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 13:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4db7bfbde0f0681efcbed52504d19b08 SHA-1: ffb870046ca09db25bbf741ba61a9c773243d405 SHA-256: 1e0b7c335474ad5d702d195dd77eac0a7724823b754420ce9e656a72d86b166f
126 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 high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://covina.crazyrockinsushi.com/uploads/files/968253338.pdf In PDF document text
    • http://domusanna.it/userfiles/files/befidetemoxuka.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/3701084879.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/9534524907.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/vijoxobav.pdfIn PDF document text
    • https://digireg.nz/upload/niwosigowejofufalalop.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/goxexodenovirejoxubuxu.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/65113487637.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613715d0706ca.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/56332915074.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/10087638829.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161443a1650ce9---92865724864.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/97845063616.pdfIn PDF document text
    • http://etre-belle.su/images/file/porubusanejufajajesir.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rojugu.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/xokojenukekogotuzefan.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/38193561561.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/mogomomeniboperisugakij.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210916083021.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/87437597100.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/finimatabizavob.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/72447868751.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/22878771567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+fortnite+free+on+ps3PDF 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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 17260 bytes
SHA-256: e1244cf6761bbb025d0f61a23fc989a3be9be0e2e649f28ef9137f2f06df525f
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10264 bytes
SHA-256: 861b5c210cd384941fffb4d051871c5da86de070e030ab92878f3498397e5d69