Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faa44ff01d00517…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 17:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d119ef4dbc3cd50c61edc0c78c5cd47 SHA-1: ccbe687bab322f0ab2dd4be61931fd1894d4dd6a SHA-256: 1faa44ff01d00517f65e28b722826fd1b5ae7d25662521096e9f4610beb587e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format itself often leverage JavaScript for malicious redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=iphone+10+x+bangladesh+price PDF link annotation
    • http://orthodoxvaidikasanghom.org/userfiles/file/fejafe.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/86418633226.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/56272648156.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/27675926129.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/98279520709.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/93251794417.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zobunazepemakigekalokagi.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/kanitedabisogur.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/geduvobefi.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/1390252648.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/97082039106.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/dotanipowon.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/66849491200.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/68570347121.pdfIn PDF document text
    • https://seikai.jp/free_images/files/98845058887.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/93038780316.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/33641560405.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/82937365120.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/keloxamogijisowuj.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/tepibibowavorotarejizoji.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/kimivewikigixuf.pdfIn PDF document text
    • http://innotack.com/userfiles/files/xegebek.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630632495.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/nosawejuxilijuwagefepeg.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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 11064 bytes
SHA-256: e34451daf4b8125ba00ed1be312390093435e05c8c50e38e913c681bdd11f581
font_02_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 19632 bytes
SHA-256: f0ce76f7397512b0cbb52ee55a47ae50b61b53b6cbc1cdb8e56b73d9782c6d74

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