Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6be11e08bdc806…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 15:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89a2bd8730bf7dbe9531d6a2753df531 SHA-1: 6c67bcd2ed5f2b107c60e633a7278fa6d2115159 SHA-256: ad6be11e08bdc806e878ab45388dafe837915f4cbb39ec2e36ab8246bf26d776
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, with a high concentration of links on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination by using a link farm. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dobrejaja.com/Upload/file/suvevixufozogiloze.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d7934f9a---vazofeturem.pdfIn PDF document text
    • http://www.bash.cl/media/file/pebumajuluz.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/15588301886.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/33330795053.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuwotejipib.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210919160619.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/25769739369.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/tedudojunuxugasusisiz.pdfIn PDF document text
    • http://japhina.com/upload/file/venupisazawapenigimexez.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zadetep.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nemegobafavajiw.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/16452727651.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/fosanewanala.pdfIn PDF document text
    • https://bunianco.com/other_files/File/dalikedik.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///9328904489.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/bewaxidigaturuvid.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/86118660042.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/sazuluwefipuzojagusun.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/47202094952.pdfIn PDF document text
    • https://beaszemin.com/files/ridop.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/60564280843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=using+since+at+the+beginning+of+a+sentencePDF 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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 10616 bytes
SHA-256: 82cdb39b8a3e200a677c4dde0f01016e1d1662e14e38b435f419397465d85316
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 18816 bytes
SHA-256: 9613576cc0d555d26e0e956e80e673ce85ba507ff8c912e3f86a9828c449df10
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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