Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55e050b4dd5239f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 14:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32a46d2e791eea42cb7d9e0e5135f317 SHA-1: ffaeadb3ebf2dff6d412e17afc6ee86a231dcb1c SHA-256: a55e050b4dd5239f82d712bc01868a18413824510dc966032b26685da1494998
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one URL identified as a potential redirector. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure and heuristic firings suggest a phishing or malware distribution campaign.

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 http://cuuhoatudong.com/upload/files/fugiros.pdf In PDF document text
    • http://biancoacolori.it/userfiles/files/nubedukuzofapi.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/mowuxopijuritivoropan.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/58578141457.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/20567437855.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/salodisewesifabuvesilo.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630530214.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jufigazerofotofemuri.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/58572005078.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/4100331589.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/movadifevakodupezemefolo.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210914093848_bz4l7f.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/zerunuwiwuledox.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210904030009.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fejatiloremav.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355f047ee60---34421970321.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/50009741012.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/xeditomunegozum.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bad0435d87ddd611511f51ae2f307e5d/keguvunodototezojeniva.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/65907515453.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/wuwironojufamiduroji.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906091039.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/71125049704.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/35397999438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sincronizar+outlook+com+androidPDF 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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 17928 bytes
SHA-256: 1255644f2e16191606c971e973d29ca5643d5fc4a9d578edc52276cd96cd22fa
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10560 bytes
SHA-256: 17337893933f389e9f76ff7bc91dced79ecde91b945677ae419134323e7ac19f

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