Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a13deb4b74cf4c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 14:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4b3b5b488e7e8620df55266256800e4 SHA-1: 25c2f1b89164cd8037ce7021be53efe2445b110f SHA-256: d1a13deb4b74cf4c821d97eb73645954a8361a82942aa11514848612aecfbdc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=i+movie+watch+online PDF link annotation
    • https://gikguamerica.com/userfiles/file/topuwoworimisegapagexuwut.pdfIn PDF document text
    • https://jetaime-shop.com/files/25050283420.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/94898133814.pdfIn PDF document text
    • http://newmob.it/userfiles/files/81007597652.pdfIn PDF document text
    • https://virker-ikke.dk/files/zirezasugenag.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413ff63360c---27334833509.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/9108040711.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/mamonajixujomuzipaped.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mivogupivo.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/57505865561.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/5424795939.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/perusakikapidabom.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/78811602537.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-3/20210903162332316119.pdfIn PDF document text
    • http://unseretochter.ch/images/file/nogip.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909191955.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/tuwusaraset.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rapoxowepizi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d079b11fc---66234114848.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/27385534894.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/04/dutodovukogotaza.pdfIn PDF document text
    • https://timminsrenovations.ca/file/Uds6s53YvRqGpmAA.pdfIn PDF document text
    • https://totounited.com/contents/files/loxitebu.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090722444173499.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_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 18088 bytes
SHA-256: deb31aa697323b9ed230394bd399f2f57ee81ff2caeddb5f4194d32fee3ac63a
font_01_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10328 bytes
SHA-256: 51c24830d953c3573b5a7fbd941639b641261b636992f6cc9b7bf81a471416c7
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1