Malicious PDF — malware analysis report

Static analysis result for SHA-256 745ae881a3ac9d81…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 06:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7b4912dda034abecc9c8b6d57e9d65f SHA-1: 6a00358fddf69290c6960b14ca24a27c7a6dd278 SHA-256: 745ae881a3ac9d8174ea3a1a085329951d4184b786106befd4f72867654002fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also features a high number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://indirimlipin.com/calisma2/files/uploads/sijiwodolekoretowegumosi.pdf In PDF document text
    • http://tayles.com/uploaded/77469775032.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/metiboninuwezen.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/33371577528.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/9649441104.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/puvap.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/15652904352.pdfIn PDF document text
    • http://quinta.cl/upload/files/15917798395.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109080425288532.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pebulegufi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/16719803139.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109040648495606.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c86297330---zovikube.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/regaseme.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/vitefonepumimoru.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/40258765150.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/damunorevokuw.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303bff78f06---zamatemupamepuxigosabo.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/121285892.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/41800307283.pdfIn PDF document text
    • http://etnorom.hu/pictures/10498402481.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905034816120297.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/gipijakuwijuwonowilefad.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/wupuzegil.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/45506816537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jonathan+creek+the+grinning+manPDF 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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 17924 bytes
SHA-256: cff72235169d24c6c8dcbea2ecf480625c4baeafe77010eb596be806cd76bcfc
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 10544 bytes
SHA-256: a24da37da13b32c25ed838b0d9553cd3582dfb9b3701cf525b4eff9ebae94cfd