Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47dabd7c6cfbc1e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 22:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287e929eab7f1c0b46070522e3fc68bc SHA-1: 85138cfa5329475efa245de064434243618212d1 SHA-256: a47dabd7c6cfbc1e03f69d05cada61883954ad78bd0ec8b8259fe6f8792ecf6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one prominent URL that appears to be a redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on potentially untrusted or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect the user to malicious content.

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 https://allytemp.ru/uplcv?utm_term=words+that+start+with+k+and+end+with+l
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/manixar.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/61417802281.pdf
    • https://ateliersmq.com/pevron/www/img/file/70662956284.pdf
    • https://kalashad.com/userfiles/file/juxebuxubexidigeraveve.pdf
    • https://umutfm.com/resimler/files/22814639599.pdf
    • http://casaledellasignora.it/userfiles/files/tinubabom.pdf
    • https://drrajanmahtani.com/userfiles/files/90673796124.pdf
    • http://dienlanhtruongson.com/upload/files/4193456012.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1ecej00bubdflog0bqktqan9gk/83639327830.pdf
    • http://autoscuolapezzano.it/userfiles/files/dilirepeluxuratejabof.pdf
    • http://sp2wronki.pl/fotki/fotki/file/wenagoxiruteref.pdf
    • https://dolmalatrek.com/userfiles/file/togovojexevadusuj.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/33565397911.pdf
    • http://tucholainfo.pl/userfiles/file/62711439496.pdf
    • http://www.atsamuihaus.com/image/upload/File/kepom.pdf
    • http://szerecsen.hu/editor_up/3733896287.pdf
    • http://gilendor.cz/userfiles/file/92684812540.pdf
    • https://atamergranit.com/userfiles/file/wubesawuzotimasimivalij.pdf
    • http://around-sicily.net/userfiles/file/vajevigemoruwulupevuze.pdf
    • http://ocean-ex.com/images/blog/file/kenuguvuzem.pdf
    • http://starfishdowney.com/uploads/files/xutedizef.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ca2cce2c---tuzotijuseke.pdf
    • https://magicdiscoradio.com/userfiles/file/nifagufiserep.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/39495027922.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d334.bin
b211e929b326114fa00fdb8ba4287add8b6c608648d138da6e50c3b456dc6931		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 10516 bytes
font_01_sfnt_off0000eb22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16792 bytes
font_02_sfnt_off00010334.bin
cb092045b729bd1ba8ad232177668644bbcb525c0c290883700196e564f002df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 18928 bytes

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