Malicious PDF — malware analysis report

Static analysis result for SHA-256 35660f34e686ebd1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 02:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed7c370b7227a13490bb9762d9b779d2 SHA-1: 5d0a088f16666c3493688e556f69ce7c700807c4 SHA-256: 35660f34e686ebd17f24a876ec67b070a04f9574d273244b799a3e4102538cc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are suspicious. The presence of embedded URLs and the PDF's structure suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abhrian.com/userfiles/files/85992961621.pdf In PDF document text
    • https://sibois.eu/userfiles/file/suwovabagile.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/doxizironep.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/32118725421.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/lagipopelarufezisat.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c26af041f70373d9e8b8630d371a0da6/55421204786.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/ladunusileganamajab.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/widotufotametugaxo.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/rozavizafejexome.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/22844268595.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/tilajinikepej.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/wawogadapewilivu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/38387678113.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/bubolutejiwifasibugixitav.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xeludikop.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210911_044857.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/soninuno.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/mumonekizaxiku.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/zokokev.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/mawujemexenumiliro.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/vubusuvuripuvimewifi.pdfIn PDF document text
    • https://laps.pl/userfiles/file/bazelufetutawez.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/sufaluleve.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/75483741140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=battle+bears+gold+apkPDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10656 bytes
SHA-256: e99f301e2504e0ee43f55526b3a16d969346088942be173dca6a0af80b0be000
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 18532 bytes
SHA-256: b1b5b066a8842d6e5f234a72894311fb54f3db6da90ee68afec630b998b9663b

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