Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc12ac5638e0fc69…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 17:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b3008f4cc05e2fc169cabcc60af7069 SHA-1: 175f61d0b29438af18f52532bd4e64ba5b1be88c SHA-256: bc12ac5638e0fc69a0e79874b28d99c1f15b969ee6762e7d062b208895c953ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to external domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=football+manager+2021+touch+apk+download PDF link annotation
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b34d8a62af84ec2979145d4dc309ef8d/2559676573.pdfIn PDF document text
    • https://fishboat.hr/files/76441054810.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/89948150421.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/8486365014.pdfIn PDF document text
    • https://buyafranchise.org/files/files/fotawexuvuram.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/29921562546.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/posedof.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/25434754925.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/zeduwinet.pdfIn PDF document text
    • http://getdol.com/page_data/file/51141204182.pdfIn PDF document text
    • https://agrando.cz/files/file/81330536800.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jepetepikesuxifeperopopop.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/vuwadewekirilefu.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/4193456012.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/87665168934.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/33930681859.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614412cdbd944---95729837122.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/pozopibebuka.pdfIn PDF document text
    • https://proia.bg/userfiles/file/75896350603.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/29308010205.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/belum.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/87869637150.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93053974445.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_off0000adf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 11388 bytes
SHA-256: b1e2ef8dd986253dbf216c40faf4268f79e5c8c1a256140d9b516ef474f468b7
font_02_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16520 bytes
SHA-256: 1482b9b9cef2d521981fabe4fd91b52f696085807d64495dce3154d5aef8d167