Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76ef147726c1e59…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 20:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1ae2f8a6a15983cdb9a74f2e5826fb1 SHA-1: 8ef389293ade170d3a8b0e4a457aeddf9444930f SHA-256: f76ef147726c1e5948875fef76a989136a6b7282ec40b4b36d7468e226b4b466
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the heuristic firings and numerous URLs point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://chcial.ru/uplcv?utm_term=rocket+league+online+unblocked PDF link annotation
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/gitepobutixerowi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/28424766042.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/xevomumoxunej.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/xomitumagavijepirozigaxan.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/81184996183.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/73926260118.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/nudopu.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/fosovalanujefukawabelagul.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/72449776961.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/3652023955.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/fipezijipasemowox.pdfIn PDF document text
    • http://yuhongzg.com/d/files/vemibulosewimovas.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vikeruzamujewizunakad.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/kafuserazisorasuxame.pdfIn PDF document text
    • https://pkbae.rs/files/28520158573.pdfIn PDF document text
    • https://phukienbep.net/media/files/bobegugexetunufatego.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3a88732b---vifolodobuburigavu.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/lapusepab.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/wososoverunebimipumojeg.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/tadufusawa.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/dokejawadovizakerosujoxoz.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/17417001415.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10656 bytes
SHA-256: 26600b3edc30469c4dfff4988c4158ef98d1f16af7f06ae3bbd45e1791a09cdf
font_01_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 17936 bytes
SHA-256: 20ba40231a2a2b1b8ba15f64fa1a8e7148643ba8ff0ee7d455fb663a168088ff
font_02_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1