Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b658ee36a1cea7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 11:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff6693997375eb4ad30be9276d7de3ca SHA-1: 6b5ba34c500ce16d1bddb8546b12bcf4154b486d SHA-256: a6b658ee36a1cea7dd7cd46be300719d3c8a4b19d0c04513178211c30a802d71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://allytemp.ru/uplcv?utm_term=top+10+music+player+apps+for+android PDF link annotation
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/84554183739.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/34838561570.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/64668668400.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/logopijibexubabopajet.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/wazilikotowovezovuwebe.pdfIn PDF document text
    • http://www.pvvc.cz/files/wutozu.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/sunajubiteb.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/fenuvavavalav.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/90602315618.pdfIn PDF document text
    • http://schokofontaenen.de/idata/vewomotepidobowufefifo.pdfIn PDF document text
    • https://nasikampung.info/contents/files/gipowejonubisimoniparor.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/pumaxuredenapuvari.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/jovotadokul.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/59985690995.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/revasoze.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/58207177898.pdfIn PDF document text
    • https://ever-progress.com/upload/files/sopuwubitaxupeso.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vubadapelove.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/61114356274.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614013cb7fc78.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/35300815959.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/90892722649.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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 11036 bytes
SHA-256: 963c5d7421c04cfa88d50c16ea148a6418b70d4bf34a4fb57a860749135f99bc
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 17252 bytes
SHA-256: ba304e2cf73889c7e2b4423000f2a0218bbcb175a0005a5a4138735f04b9ab09

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