Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8b4014f7ff6299…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 18:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 193d10de188e3b63c10886a02a4b8a8c SHA-1: fcdccd98d6ef8e6b98743555f57d50ff6b9c478f SHA-256: 6d8b4014f7ff62995fe2b7626953759bce11db9e0b90a7650cad35ce16be2a19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xahscw.com/userfiles/file/27126544250.pdf In PDF document text
    • https://betentour.com/sites/default/files/file/fukogu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/baragapopaxi.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/42364470839.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/82324356914.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/20341217939.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/malazewovuxapo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/17535932238.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/93327876294.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/99144244608.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/nonudagananidawifepo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/43048bf93ab940f23cdb4ecae01e2a4a/xazonawufimeroxomabe.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/6745601236.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/84462496542.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/vuvene.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/sizugupujodaneliw.pdfIn PDF document text
    • http://gaudi.tw/upload/files/79564309056.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/13429178754.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/94317492887.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/woweguvinokuxiworonupude.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/vazibafilomazote.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/losazikawalifanuzige.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/mabafezuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+restore+my+android+phone+to+an+earlier+datePDF 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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 10848 bytes
SHA-256: 494413d78ea4396e40fed5581a85a2c216a584da762f7ad300798e1ecb240904
font_02_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 16992 bytes
SHA-256: 83b2cccdc56b4ac6cb9e880aaf7bd46931e46215319f6d650267b3a2d4c0fe62

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