Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe16dd1143c06f0…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 23:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0c3236573f7748c374126d7e9c64b6e SHA-1: f053298d6a2f257a951b78f9ad7765c88a1b8b79 SHA-256: 9fe16dd1143c06f04386f33e1b3bf79c5c130651a4ffb896837240d37fc64642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URIs, many pointing to link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=game+emulators+for+android+free PDF link annotation
    • http://nissanotogovap.vn/uploads/images/files/50828961624.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210904064347.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/duzume.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/gorew.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/19665958665.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/mowisejebivop.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zaniz.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/70040951032.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/29368287115.pdfIn PDF document text
    • http://119pump.net/d/files/levuvoz.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/49027710603.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/83980336089.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/jewokamuposikexen.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/17/17108792829.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/taputato.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/74981752851.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/jebozezakunefibunawilem.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/vadule.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/zekamumipimujuzijodafepo.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/giwivebigapurozu.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zozidipiparelizinapem.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/fitatavovifomoda.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/17115281705.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/54168139970.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_off0000b2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 16868 bytes
SHA-256: d2b5bbcc7a095ddf0f637c3ab452bfd7c39d2523bb91fb611c8e2d15b25fa89a
font_02_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10656 bytes
SHA-256: c612bd99ed3c5e2ec0925d4cafb5dcad726641c1720225ee3c260cbf4ddc8b91

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