Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7f94e318b96d9e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 12:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2d5731d100469226e775b3fa2f5b64a3 SHA-1: c33a469b54731be0e063efc44dcddffb9a882a32 SHA-256: 8b7f94e318b96d9ee5fa707a753b233b19cae3eda74da76beb346805541d8059
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=wrc+the+official+game+apk+full+download PDF link annotation
    • http://tuecpa.com/file_media/file_image/file/14901782477.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lalubabogonokuduvusiza.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zegapezogoxodup.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6923e5e1e2bc9e4faf4138702da159b2/zebedasalofo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/23575565941.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30796456512.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/75380773697.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/30046323540.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/penaxatoxaze.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/kidujotitoxolalexes.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/68518764954.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109290157575741.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16151e02040d56---54086730985.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/86621170696.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed4e1b3f3---23039580425.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/nokowakekafudo.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/falijiwelejotekavolixodej.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/53834418422.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/9978993012.pdfIn PDF document text
    • https://esvigo.com/upload/files/leviwuvapuzuduxuneji.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/vevorefitapikarupefozidej.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pakozifefudivibujiwud.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/rojabirebojexome.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/22171637999.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/7260578820.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/venunigiloruxija.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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 11168 bytes
SHA-256: faed84a496ad03f77bbf5416b81e9e591e776dda72605fd75ff65e81d8a3ad5a
font_01_sfnt_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 15764 bytes
SHA-256: d85475adba72ecbfbbc75d58e3aad8e3525a3e5931e72562990fa0a6a4bc548f