Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ccfda56c88eaed…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 00:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2a55760f5ec58c14467f1dd08b4f8ef SHA-1: f87a6c51dcb6a7ce805c0301d3d99de4df1e2275 SHA-256: 41ccfda56c88eaed209e28cb0b9e1f0227c5c82f65c473b405d9809ce480b5a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a redirector with UTM parameters, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards an attempt to redirect the user to potentially harmful content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=android+hotspot+usb+windows+10 PDF link annotation
    • https://cuisinescartier.ca/upload/editor/file/rekasimupulaxubirudasofun.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/31851079466.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/67574784546.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/83872475939.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/34543970659.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109051257181113.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/18173351040.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/goruwatopefaw.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/20340760396.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614319361249f---19278085814.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fipidowixanelifejegabebus.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/97171932899.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/69946286310.pdfIn PDF document text
    • http://precisao.net/files/files/numesitolibokajufafut.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/39597483709.pdfIn PDF document text
    • http://njchemland.com/upload/files/33749221397.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/vavelorafese.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/2257577183.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vixudexivapozajodufavelen.pdfIn PDF document text
    • https://limsurempat.com/contents/files/jirivibujonefagejoxema.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/67189361923.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zatesazogamevabe.pdfIn PDF document text
    • 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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 10628 bytes
SHA-256: 0d0d43183d459767ceda2582abe7764eccbad97f9092e3500647f4be9b22e6a2
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 21560 bytes
SHA-256: 51f5676f54a2e00490b330c4d34a163f06d032774b833187ac87cd897cd4a2f2

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