Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa041f42548ff91…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 04:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acf00062f8e8792ba67fa05e221a77cf SHA-1: ff3ed64c9b4716ad989e40f9370dc4fc1e2c115a SHA-256: 7fa041f42548ff91f770e0973bd1ac1d266717156008fa38ad39f1a7ef80b991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a non-clustered link farm on disposable hosting, reinforcing this assessment. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=redmi+note+8+in+bangladesh+price+2021 PDF link annotation
    • http://amongelite.com/ci/userfiles/files/ziwodos.pdfIn PDF document text
    • https://dafelia.com/files/rifowunu.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/30664701440.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/wefoxiseto.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/tuluvufaxirofalug.pdfIn PDF document text
    • http://medica-brno.com/files/34129946603.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/rarujewevural.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/senawino.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/surififofa.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/46233241874.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/1987632803.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/fanogu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/nenojovoruzisipevirusefi.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/65644864447.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/duxepidir.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210909185934.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/nisidigikuperenimetibefu.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/kulubeg.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/tegibakokubud.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/vawavopikexowugeka.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/nisegivurag.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/6636200187.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece438051---29887219178.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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 11648 bytes
SHA-256: 524eb02402263b6e8a6b6c71cbc7cd51ab3405b3f22a3bf2421356e6063e1b62
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 18152 bytes
SHA-256: 188ee8976df95497ae824e5008bca86340b9385fab1fa9feb9a5ec1a1ebecb1b

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