Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0283b567eb2538d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 16:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf5bb45fbf4eed3e6fa3411b47c1df6f SHA-1: f3776c2260b89c4802400f35bda25681be0b63eb SHA-256: d0283b567eb2538d82cbac4df48de0a1a78b2a0ff8a0e075ea445809c6c5239a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a likely phishing or malware distribution attempt. The document body is unreadable, but the presence of numerous external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=what+is+the+obb+service+in+pubg PDF link annotation
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210904_035805.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bunepimuvalawawofika.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/luzuvalow.pdfIn PDF document text
    • http://mosjob.ru/images/file/53284833568.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/60769190936.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/fupegitafolar.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/19281694103.pdfIn PDF document text
    • https://sapporopools.com/contents/files/lepalolitasu.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/40196261641.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/zotawidezixovusat.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/serewegenibiz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfca89c353---64585446747.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/vewew.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/deraw.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/83936035580.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nuluzimopojabanixem.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-13/20210913190304157797.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/xipimulefijafow.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411b53a4995---24262478654.pdfIn PDF document text
    • http://webs123.com/userfiles/file/43309554361.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/motipisexajawuwalegig.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/dopuv.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/48756748931.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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 19796 bytes
SHA-256: 8a9e399f6c278312c7c8a88b577379113ac9b264acbec12a58f267fdcfe597e6
font_01_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 10908 bytes
SHA-256: 38af018869b26bb4adb83487b477236ee66ccf5621d04acc52bd0fe137b871fe

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