Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08c4d57cfdbc53a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 10:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5fb86938bddec6d1ef1ab3136919b541 SHA-1: 6ea5d97de7181461e40dcc1a2cacdc4aef5df486 SHA-256: c08c4d57cfdbc53a0d27bcd22b98ad17d8f77f2766b6a74b79a919f5d6ac4d2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/64f39495c876cfe54e07131bc68a74d4/mawemor.pdf In PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/siwofop.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/7748968976.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/53832515693.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/97581855054.pdfIn PDF document text
    • http://wohntraumgmbh.at/1047845003.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/devof.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/zefopofiwepokavenedej.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/89717620637.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/56672696815.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/18182749335.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/88307367474.pdfIn PDF document text
    • https://regenerateacademy.com/file/fegifutiwopewepenupexeg.pdfIn PDF document text
    • https://highrise.pl/file/10518618505.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/gesonewulitarul.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/vorajitimusife.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/xataraf.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/15082913977.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/25986585567.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/28152283455.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kulizujogotulogakusedefag.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/76070979171.pdfIn PDF document text
    • http://czyxchem.com/upload/files/30831168075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=planner+5d+unlock+all+apk+downloadPDF 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 17460 bytes
SHA-256: e0c350a697ee133738fcbd3071872d77740ab53e3fd87c66f903250c21e25eab
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 10564 bytes
SHA-256: 2b8c7d730751255b48eb68348103d6b5f506aadf04ca365f6f34a013fdc9e6df