Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d98c884871fd5f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 07:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 167020c22537a7fded209a7fc856ad8c SHA-1: 36b88ca59893876574edbe855494555330080082 SHA-256: 39d98c884871fd5f2d95a0373e65a8c9f5e79acff15af36638c00e88cee483fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The PDF structure and embedded content suggest it is intended to redirect users to potentially harmful external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://dailyxedayhang.com/userfiles/files/44337412651.pdf In PDF document text
    • http://krakow4you.pl/krakow/files/tudeleguvokugo.pdfIn PDF document text
    • http://greenld.com/userfiles/35977502653.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/22949342366.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bokixofoxidaketudebuxipu.pdfIn PDF document text
    • https://norservis.info/files/files/788116065.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/mobefazimonujipale.pdfIn PDF document text
    • https://tigaintan.com/contents/files/95961560462.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/13378930198.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/jepolimoluwewamifuwum.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_193217.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614704cff3d13---76992618812.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/binojoxu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/22710617713.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/sijuwosobulugokopurer.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/xiwegulalikovifo.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/dodexijuzupipibedaratavo.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jetifigaxux.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/31344715596.pdfIn PDF document text
    • http://chpcentre.com/files/file/76747440222.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/vetorurukuradiloko.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/41551452657.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/tabareronosigopavop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+root+cherry+mobile+flare+s8PDF 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_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 17608 bytes
SHA-256: 8203dbde1871c368d5754dedabd1bec9bdcfdd5f6b69125aac1c3cad5ab90551
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 11036 bytes
SHA-256: f28d22b638adc0236ec0cf950d310e2dd1472720cc4b7ebde49bd278b30a4db8
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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