Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb97461cbeb252d5…

MALICIOUS

PDF

68.4 KB Created: 2020-11-20 01:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0a2c2660e2bd577312dd942c0438b0a9 SHA-1: df18be0603560a87d52ba9b40cabda4d9d947a6f SHA-256: cb97461cbeb252d5bd6c4d812c0fdb0b40338202e4ee8aae87419d0a76951e10
206 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a QR-code lure. 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 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trafffe.ru/strik?utm_term=samsung+eh5300+user+manual+pdf PDF link annotation
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/jurulobeguvoliloxel.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/6443274.pdfIn PDF document text
    • https://zagezawuguzuvu.weebly.com/uploads/1/3/4/7/134731207/9075184.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/mevusesez.pdfIn PDF document text
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/3675636.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/7250537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c0286717-52f5-41ee-b348-8abd4272e3fc/7581218603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484f8fb6-62d5-41fb-9659-a362e0fa45ac/zogotubofewede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d655249-9b89-4cb9-9a97-943d8f880603/bajofinumojunu.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/99985949085.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/ias_interview_questions_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bdf600-f32e-4718-9f75-a21380e15879/sogosetidunuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274beff9-dc42-4052-a8e3-fb278e94012b/somawiburigi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 5632 bytes
SHA-256: 1cb732bae000727b6a236daa75e6aa9816cad6c53cf9cba533b47ff850cadf0d
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 10308 bytes
SHA-256: 59fafa4fb1ea367e18dcd314b195f1b715a8208a831c8998c93a7cd95f9a88be
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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