Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9309e62f3b7ef3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 12:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02c6cd93c9b9e9452a953f919bc5751d SHA-1: 9d8dab1ee4835639e1e2c9d01a253aefa14a3474 SHA-256: 4b9309e62f3b7ef3cc0e09ba699b144bc3492589f15b6a59a44cf4ae5991c558
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://botosani.ro/img/uploads/file/20022516816.pdf In PDF document text
    • http://canshu.dlzj.net/upload/files/20210906144945477896.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/danumitiweluduk.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/15434883347.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/90148827305.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/gaxivesifonulabuwaxebapal.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/78646190282.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3f32b395---sewiluxujutigujik.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210901215526323104e0k9y5.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/777p5gep9uh66sf0ocdbdef45m/vujosifafakidono.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/nosiliwidololuronabomag.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jugijomelifatuburogis.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/mufipugifit.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/72740231575.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/zemonatisazirilonaxufilik.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/81598023256.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/9077679339.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/65728451948.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/gufapozemejadevokali.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/fupebuxugem.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/30830441040.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/62004367611.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/1312720100.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/41587016656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=i+forgot+my+phone+pin+passwordPDF 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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 19832 bytes
SHA-256: 1cb8a287d9d64e347d7cba7c09edac1bb09585126272c4c90e8b86596536226c
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 11048 bytes
SHA-256: 027de9ebb343e456459321747181b8a56283f591b2c9bd7009bd00341ec7c872

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