Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ace4cc6c18ed7ca…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 21:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10ee0d684ddf2ce9ad56a12035af89ad SHA-1: d357009ec8dfeca904959083c9276f2aaa490f64 SHA-256: 6ace4cc6c18ed7ca65117e46708e5860181027a0f64daea1ed967f40491ef585
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and contains no readable text, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=wevideo+app+for+android PDF link annotation
    • https://bisnismedsos.com/userfiles/file/gijaferosunupamibisu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/kalodubowurego.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/32265286481.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/84946659751.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/witivosoxanuxusijutixobip.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/pumojeka.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/pifijigiwaxavakivoj.pdfIn PDF document text
    • https://tekartltd.com/upload/files/17676197141.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/30225052477.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/3099846528.pdfIn PDF document text
    • http://esejsc.com/upload/files/jitamis.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/wekivev.pdfIn PDF document text
    • https://blogsma.com/files/budajinuguropupijos.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/sofuxakejikaka.pdfIn PDF document text
    • http://agilesolutions.in/uploads/1032081697.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133850010b32---23182898769.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906012143621542.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zabolevekojagerokigixebuv.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/madagafaxijuref.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/47204451219.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/tumej.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kavuraxafufimumabewowen.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/tudesonebejixexulopon.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/5740899547.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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 18200 bytes
SHA-256: bc066c6dc4a7e60b753abb7a4dc9151a1f46f44ba37f3f4f21f2f7715e32302e
font_01_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 10236 bytes
SHA-256: db77f5429fae9ab7d59c7b6a7594853204f3cf3e77bd9b8db7b94530d0ea3dd5