Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdd1f6f2474f4a8…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 19:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c4182b7d76d089f54ce6fb2c75ff9a9 SHA-1: 964489ee297bdb6058858c2b199e601873008cce SHA-256: 8cdd1f6f2474f4a833e0152c793c18a0102586d1c7c2873703921507b0a06717
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to various domains, likely intended to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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.
  • 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://stmpallet.com/ckfinder/userfiles/files/94654236564.pdf In PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46305842672.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/d8btt6i3gtkv6os4sscdapq8uv/87433068617.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109080927065435.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/65939329050.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d060e368de---97075914269.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210919_3A45CBA2B7EA6B12.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/73137822537.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/42769580935.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/dikexufuxafazebidazol.pdfIn PDF document text
    • http://umhouses.com/uploads/files/78261469686.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/89616558375.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/lesisujemar.pdfIn PDF document text
    • https://armenia4d.com/contents/files/ropovejawegi.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/rizadutavofuzasemufotifo.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/kodabexevidap.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/savunusokebufada.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/nosugoxevavug.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109130758326591.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/72361379664.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/28416012391.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/xigesonejawekegurawupig.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/64527645369.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/65313112360.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/gevaminodiwus.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///tovevekunekikedebavirale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=beginners+guide+to+d%26d+5e+character+creationPDF 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 10368 bytes
SHA-256: 988d51f9a48370ad843d56e878d278be934f7bdea9cc4999638e30dc237836fc
font_01_sfnt_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 15340 bytes
SHA-256: 42c70310d052cf97eea80d78ded32698cffb5ec692b86f927bd8e3b1d2856574
font_02_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1