Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7595a6eaea4931…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 20:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 250f2c45a78e0b1161ad814a660e842c SHA-1: aeeb5cc70101df8dfd5c3b968fece6e86e7cdeed SHA-256: bc7595a6eaea493173f802b689204dd014f622744dd52e7dd5035fb4fd5726ce
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were extracted, the presence of multiple unknown URLs points towards a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://marcvandewiele.com/userfiles/file/75278166366.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///savekawulatov.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/dofogelozadim.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/35526187021.pdfIn PDF document text
    • http://8njl.com/userfiles/files/84364604401.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/bezokuxovimofujin.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/bozovevova.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/11917937566.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/gatovaxumumirelu.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/51704701561.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wumeliwosupujob.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/fosupopepugijorolotawiru.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/40950479300.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/rimox.pdfIn PDF document text
    • http://labsshop.com/d/files/nemulokadas.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/rutagarib.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/29367890109.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc4d69e56---zagalesiw.pdfIn PDF document text
    • http://masonhn.com/d/files/sarat.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/19890162517.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/27668822972.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/66514300344.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xerekobafadifawivi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vapuvezatidazabujaxajo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a8949319---fuvuwadal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bagaimana+cara+mengupdate+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 10796 bytes
SHA-256: 4d9f4e459e26d107fb99cbe34805ceba88680d762529d5064ef6fe9789200e09
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16532 bytes
SHA-256: 1e08ae86c82be7942390d1c78dc7b466817da50cbdd34ca85561bc5eb28cdc69
font_03_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1