Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecc88177cc9627d…

MALICIOUS

PDF

80.9 KB Created: 2021-03-26 07:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b8a60c34c11a4ed9a376e256738e1f65 SHA-1: 53965a9b7647ef0e52d53045ab34c332c13e74dd SHA-256: 8ecc88177cc9627d6fdf17994c8e0ab66b25cf8a98e9ab7864bfd8c9fec3eae5
186 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. 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 0.9998

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://resalured.ru/strik?utm_term=conversion+milesimas+de+pulgada+a+mm PDF link annotation
    • http://magnetfix.store/facebook_mac_appkr3by.pdfIn PDF document text
    • http://giocodigital.fun/outdoor_gate_keypad_locky7e0r.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/2avh9LY/waduxawufa.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/O5ggdte/captions_for_photos_in_the_sun.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/temanupevopoxobime0mh8c.pdfIn PDF document text
    • http://ru-order-687646765445.art/2003_toyota_camry_jbl_stereo_wiring_diagramovnv8.pdfIn PDF document text
    • http://mavitrade.com/mavuvotegunnh3g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_6f935a36d57a4f6ebc04054c9a7e9a01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e846ae64-f93e-41bd-baa4-bda35b147f36/fekudevamexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c2c4af-41fa-4eb4-a6eb-8eac23c5bb6a/5088472549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaab4f7-c7a6-4f94-8770-2997519fcf12/logugolisi.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_bfd7f1f91f284bc69e2244a06fb5bef2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1684fb7c-55b3-40e0-8841-52ad36578ba3/20407256481.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_7ecd8970a03f4c779d9ec13ce572ebe1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fb508a-ae82-4368-b631-8235881e5597/flo_error_gecko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eee7776-ca42-44cd-94ce-670d7fe0a9b3/79412525331.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_b8befb1600104e969b3ad6932b42c9ee.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_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 5244 bytes
SHA-256: 3e80df380279f3665503aa434cb37ad4c2d08f5d090896336af96cec547095f7
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 12528 bytes
SHA-256: d153fed9eb1c63bf9a9ef85d33a41d9559698e4d3dbca4776d07309a53fce9e6

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