Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a66a49753c8fb8…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 11:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cf6ae9818d655528b6f40ffdac4ea90 SHA-1: f1567d6f2eff1e35ff7839755325e23b1e2a006c SHA-256: b1a66a49753c8fb8de1c75b98930ee01fc24703cf52b5286a5f307d64d8a78ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the idea of a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the overall detection suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=how+does+ethnocentrism+differ+from+cultural+relativism PDF link annotation
    • https://tutorsbureau.net/userfiles/file/zuxixub.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/56252592320.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/lisexat.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/78019429395.pdfIn PDF document text
    • http://silver1979.com/upload/file/7530722925.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mozubokojiriterilizetew.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/28480349118.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/zudobilezaneruvoziponudat.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/33656190806.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/22945352859.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/palel.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154198d84bf7---joruwujuviditalarafo.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/ruzeduvitog.pdfIn PDF document text
    • http://scoutpate.de/userfiles/file/68556155221.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/21974142194.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/11881471097.pdfIn PDF document text
    • http://precisao.org/files/files/wekef.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/73809904340.pdfIn PDF document text
    • http://lj-group.cn/upload/files/nexuram.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/tikifidu.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/57167266299.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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 10984 bytes
SHA-256: a8f82bb1414b1ca6b812cc11f1c56e89f60a68dbb8474801e2ce355216d7b0c8
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16036 bytes
SHA-256: df5699ade219d80ed7b67054629ac74335996211577e6abda896b2c8d3c779f8

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