Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b97fc36f6efd07…

MALICIOUS

PDF

76.3 KB Created: 2021-09-29 00:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cdb730589eb634b67f0c6b7b17efe54 SHA-1: 557c279572c007004be3d7708aea88b2ae4e86c8 SHA-256: a6b97fc36f6efd075e4a1a80fd957e9833dd5d95453ecd1a5bd6302a795105dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vtaky.sk/media/file/74424217456.pdf In PDF document text
    • http://primaria-ciocirlia.ro/media/file/8640155537.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/sixokitixofumotej.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902010848.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/nevifodokinoguruv.pdfIn PDF document text
    • http://gewald.ru/content/Files/vuxejazusexupotipunixu.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/86749784611.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/885027376.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bebojawunoremub.pdfIn PDF document text
    • https://pellevah.com/upload/files/niwija.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/pazubimofonut.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/sekuwipijuvoputepulivure.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/82284782426.pdfIn PDF document text
    • https://petikdaun.com/contents/files/37850248868.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/dowininegolisisofora.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nexemoperirigajodim.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/biduda.pdfIn PDF document text
    • https://invision.buzyhub.com/files/42398297771.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907095005_03pmff.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483023507ca---31551028158.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/76021022714.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/kirola.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/59032236382.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-16/20210916011024902785.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceea4c46f---xetituwajos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+i+was+doing+while+you+were+breeding+pdfPDF 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_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 18092 bytes
SHA-256: ec4bc6565cea58654a2ad76a60286e7eadf11470b8104a5e9f7d4c380c89a424
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 11208 bytes
SHA-256: b282da25c19e329c094afaef2b314e8eb6dc9682c7874dd9f9afa1aa6b5351fa
font_02_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1