Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc4bae612bd25c1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 18:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ea20dd92bb86905d09fb56510dbb03a SHA-1: 31dd7ab58af51a677bf25dc07a106f9143fb35b3 SHA-256: bbc4bae612bd25c173a7f779127c97a67c6875fb95ba8d65b60322b84ed654d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms or disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded URIs suggest it's likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=frozen+throne+android PDF link annotation
    • https://ngonluathan.vn/images/ckeditor/files/tosemilek.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wolulejuxupuf.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/26583513793.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/26173702032.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/63115789939.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/lulureminowerulikigu.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/ritidedobavasabe.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/86758644835.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/19721693557.pdfIn PDF document text
    • https://hsse.cl/files/nuxisupokimepiwivij.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/xogotisujole.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/28582119791.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/85532783442.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ad970210b78adb604640260220a443d/soxifidefeloxemox.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/tidarulepasosufamig.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/fasaxetixagesewoka.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/21617578305.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613554fe4748e---96416570419.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/86438633556.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/56895349811.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • https://okazionche.com/files/vugotetidixafanebiw.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/29479957600.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091520520897.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_off0000b0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E0 10168 bytes
SHA-256: 8a1837eed9ff9d7dc63121bd58d0444a89284baa24fd63055e33bd205a6dade6
font_01_sfnt_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 18108 bytes
SHA-256: ec044c05a7f35218b6e6e086c95568202e14707a7fc7a8849a55210d3321c7d1

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