Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d597b8420cdacc…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 01:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 674dd987b620702fa73b77478bde1693 SHA-1: 8d1a92459ce4964ed8eb6aa78442b5141634b5eb SHA-256: 12d597b8420cdaccc9697d39feeedc9a33f5d886cd2d8e217aa1f49bfb39f534
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://uptindia.com/newsimages/file///3562167864.pdf In PDF document text
    • https://ph789.com/pinhsuan/files/file/biwugoguwigurosavepunuk.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd86aef8d---tixupedatebovulalevuj.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/165565264961318e4d5f387.pdfIn PDF document text
    • http://htcable.cn/d/files/manezalexaxijet.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/neguwelakima.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/turutazinixotawu.pdfIn PDF document text
    • https://renault-service.com/userfiles/rapotisofixif.pdfIn PDF document text
    • https://mkontroll.hu/File/rawemilinafi.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/45736728603.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sokilizinubezosevux.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/53281236235.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/nokemisujikozitagepa.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/69526202498.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/17110997137.pdfIn PDF document text
    • http://exosushi.com/uploads/files/2438544943.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb60227c4c---letugokugi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/mizilisilugiwi.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210907_881B85C69894E712.pdfIn PDF document text
    • http://rayanchem.com/d/files/nawuwurob.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zakexozopigezaxuzi.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/59167641283.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/74876881196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+patriots+mgsPDF link annotation
    • 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_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 10512 bytes
SHA-256: a8b50825f8d1590e3c10e462949d47be16b6bcf817ad403f4c22bbbd7d304b95
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 18536 bytes
SHA-256: d2680223098946e9031e4a524e4d20d1b9137244c8325bc97fecf8dd76f4d94c
font_02_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1