Malicious PDF — malware analysis report

Static analysis result for SHA-256 2951f2bf51bbbc18…

MALICIOUS

PDF

76.3 KB Created: 2021-09-27 14:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63d2c0dc4639d92d596dd1cb18ccc9e4 SHA-1: 1f5b01d2e49e2f96fc7faf3766bd13a72173f29a SHA-256: 2951f2bf51bbbc184c511468b391735e3676deef67378c09be24d8d1a88f7059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/galudiwem.pdf In PDF document text
    • http://chono.mn/uploads/userfiles/files/wiruguzoduxojonov.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/kekubiz.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/55188681885.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/relusumifedogo.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/nuluro.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/naleliradekiluwiwi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/vupejutukozakiligo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320fbd5413d---goxujebolud.pdfIn PDF document text
    • https://ptogel2.com/contents/files/zamijerorababeniwovumu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/55625894253.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/rofewaxamov.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/32582028322.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vamukenuvilis.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1cdeda48---madipavunibizinakoxix.pdfIn PDF document text
    • https://bloomeng.com/uploads/73584682762.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/jipugavawasaferuton.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/39954160968.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/98476432279.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gifisaxuzidamexelex.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/64654529456.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/xaganagikazuxipe.pdfIn PDF document text
    • http://holzbau-napetschnig.at/25274737208.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/posamiwiboru.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/birosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+plants+vs+zombies+2PDF 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_off0000c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC169 18684 bytes
SHA-256: 2bfe789b0c1ab539e2829ffb15c991f0b9ac22e409227bd2dbe075a9b74ec2da
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10776 bytes
SHA-256: 8988914f43048c9ad20cb3e2ff68f5d00e771349c88d8a6262e89cdcb8cdf67b
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1