Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4840a19d64072a0…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 16:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 128d9dc0b5b434131c997970181dc4af SHA-1: 065af5a4fd5bf6f65ee67f42c2ea717bb3068f81 SHA-256: c4840a19d64072a008c7910a02b2eaa5ed144773d044d21a94aa48e463c02474
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to potentially disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nsdadventist.org/FCKData/file/zisegudupe.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gimonuzazirotal.pdf
    • http://savitaco.com/uploads/images/files/28753421885.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/nasojokaxupojorox.pdf
    • https://portoggitter.no/content/files/userfiles/file///91411485865.pdf
    • http://hzeiger.com/userfiles/file/81720737155.pdf
    • http://evo-models.com/uploads/userfiles/files/gutofidokewuwa.pdf
    • http://www.perchegouet.com/ckfinder/userfiles/files/sajaruwozuxekozajuk.pdf
    • https://kultmotor.virtualbodybuilding.hu/images/files/74764530493.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/luvix.pdf
    • http://ekopaczka.pl/imgbrama/files/xuvagedadesapiw.pdf
    • http://millenium.moscowfashion.net/content/xuploadimages/file/madekixojejomadanuvidig.pdf
    • http://gelikonline.ru/content/Files/44454595033.pdf
    • http://debnine.net/UserFiles/File/93510367971.pdf
    • https://medarbindia.org/ckfinder/userfiles/files/pezijed.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/50787987826.pdf
    • https://resttour.com/images/userfiles/files/72944993442.pdf
    • http://arisutour.com/ckupload/files/35252796237.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/xuwubutuvemurogatanufosa.pdf
    • https://tkbhanna.com/ckfinder/userfiles/files/zixeremijodufilamipid.pdf
    • http://hifitness.hu/userfiles/file/16017857642.pdf
    • http://sowiik.pl/userfiles/file/boxuxopu.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/68627928857.pdf
    • https://sukaunited4d.vip/contents/files/92651431875.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498245b3f40---zuravifuwepugepes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=convert+xps+to+excel+online+free
    • 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_off0000b1b0.bin
0e3ea3bbf05331c4617631ce99afd6c3e5d5855262b679c96f3a6cfe3da96c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 16932 bytes
font_01_sfnt_off0000dc38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16792 bytes
font_02_sfnt_off0000f44f.bin
3bdc876311ba693a20661b59e01a6ed84d26431a65bcc07197d1337c8a6c6aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10512 bytes

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