Malicious PDF — malware analysis report

Static analysis result for SHA-256 f419e423b42ecfd2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 20:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c384d49f4d7fdc833ba6bf3c3d01226e SHA-1: dffefebba84c4b57e90e07b4847ea3981e083f0f SHA-256: f419e423b42ecfd2588af774d2b8ea16323b6d496af0ba6560a294540f08b192
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's part of a phishing campaign, warranting the Spearphishing Attachment technique.

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://philabc.ru/uplcv?utm_term=upgrade+my+play+store+app PDF link annotation
    • http://tinhdauvietnam.vn/upload/files/voxafogemetiwefurepaniwab.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/verulegekorenexubi.pdfIn PDF document text
    • https://micsys.in/userfiles/file/16446035385.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/xoduzenujixituk.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210917134539.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/bedebefujijutusopumo.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/62913546067.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/nigir.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/sonoxozuzixejexozopimak.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/18321228552.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132614fda3d7---kozadanowubu.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/14208013220.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/21043715137.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/49075548822.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/jopil.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/jakomawixemewenutasoxolej.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/sizuwutibozorawetokebipuz.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/57673990865.pdfIn PDF document text
    • http://hkwwta.org/userfiles/zagagamirex.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/54681719730.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/75164696628.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xigagamawafubumeroneb.pdfIn PDF document text
    • http://adice-area.com/pictures/files/70678096787.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69981505091.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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 17644 bytes
SHA-256: e5d8a9a947b63b43122797160cdbc94c12d6e575fb043eac445f21041bc3fe28
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 10660 bytes
SHA-256: a63bf311b6de1365ea02a48273cd96d26e8cc1f8bdc58d7a855cf0bb6f0063d1

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