Malicious PDF — malware analysis report

Static analysis result for SHA-256 815f16ed7f2040aa…

MALICIOUS

PDF

82.1 KB Created: 2021-10-06 01:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e53c91e810dd5286cb10affd33dbb8a SHA-1: 0ecd9d19f9e5306e4f0898e332448b2efe8cd0f0 SHA-256: 815f16ed7f2040aa077fb79197f4e266dfbe5ffb0ce766df69a514773bf1024f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=lady+a+our+kind+of+love PDF link annotation
    • http://ilovechardonnayhills.com/userimages/55091963164.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/14688238409.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/pinedonixu.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/piponixadaseseluma.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/lugerewepodutudi.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/82174591533.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/vazosoku.pdfIn PDF document text
    • https://cope.lk/assets/media/file/39712280632.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/62695606863.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/bifimoga.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/38503976836.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/33600163447.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/88080117947.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544cb750963---fosagisinib.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/worikuzubesomemepigijepa.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/tenawomane.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/dezun.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/gojos.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/96785201444.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/parunegokukexu.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/83131730282.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/51557089981.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/sekulikuwumowolubumi.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/89540945371.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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 18596 bytes
SHA-256: c5d0069176030f66bed2406e1baeccb275f5eedc6d7c9ef06f030b801705662c
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 10412 bytes
SHA-256: 46d6aa01c25e10a5a0b17a3e9bc9e96f4c9676b47aa83b7a03e5a21ef884760c
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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