Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bc55cc15d80edd…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 02:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d4ab6aab0ca5867aaec8b11d1e692c01 SHA-1: 41ae269e9b0b974864ac3ded81799f68cb40441a SHA-256: 68bc55cc15d80edd2e67f3978601a01df5d4959e9328c7722bdb5f6b7c595f36
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=end+the+federal+death+penalty PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fdb16d4d98e4.pdfIn PDF document text
    • https://nogexumojadug.weebly.com/uploads/1/3/4/2/134235638/05b5072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6067a57dc0590.pdfIn PDF document text
    • https://ravaruxotono.weebly.com/uploads/1/3/6/0/136087447/ruzebovedof-risoxi-xedazebebovimo-nizadiroduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_600d709f59375.pdfIn PDF document text
    • http://onlinetiser.website/86972392570b14fl.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/tutereklss98.pdfIn PDF document text
    • http://rankingcoach-seo.com/katuniguvunojurikulapex003o1.pdfIn PDF document text
    • http://vsspb.ru/guzikeg46ti.pdfIn PDF document text
    • http://damvglaz6.xyz/el_coronel_no_tiene_quien_le_escriba_teatro_valenciat2r7g.pdfIn PDF document text
    • http://keepqifi.space/nepebidagekikgsf5.pdfIn PDF document text
    • https://buronoveze.weebly.com/uploads/1/3/0/7/130739674/jewubokuxomoz-wifezifegi.pdfIn PDF document text
    • http://verification-help.com/nursing_drug_handbook_free_download8anix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/298eb9f8-b0e0-4d1b-b858-1a6be377a29b/garerenurufumekixiruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba192c17-505e-48e4-94e2-84d98d6003e6/wuguvuxorazizutikafati.pdfIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_cbe3988915ff462b9c12dc23bf1536ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ce240e-4bca-48f7-869c-03911c51dfe0/dosize.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_de303a6ab9cb471c910f155e415ff34e.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_d2f22537cbd64fe3bd86b068e9462c04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/973063d2-5456-47f6-a6d2-3086076b5a95/instruction_manual_for_fujifilm_finepix_s1800.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_e6e7b869bb9a4183b0126106bf86d400.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d8540254739944578aa46f788d3c3a47.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5012 bytes
SHA-256: b84507fea06a318d18041fc0e9ec8f97f02b8f8415f82e5fa27ccc690a5d2e7b
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10940 bytes
SHA-256: 77de80a891628942b64c34e5107c57c6a92d8f3a2b029fb74fdc31cb80a42ee6