Malicious PDF — malware analysis report

Static analysis result for SHA-256 775f8261dd459162…

MALICIOUS

PDF

71.8 KB Created: 2020-11-18 17:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c6750bc4e19a5904168521bc6d4bfb67 SHA-1: e3035a971626bf2ab998e0575a2dcb74d0eb00d1 SHA-256: 775f8261dd459162133d1cf79036610ef6a2ea433ac6c8bc2b80a44aaa4bc27d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=port+clinton+ohio+lake+erie+fishing+report PDF link annotation
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/aa978d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_5fa691ce3abd1.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/lelija.pdfIn PDF document text
    • https://bizigixuwufi.weebly.com/uploads/1/3/4/6/134692051/fozaf_xowiwo.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/fagoguvege.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/zasopedujitaguj_kojotutef_fosoriga_fafefuvet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fa7ce0603e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fa61ca0dbffb.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/9074411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_5fa5e18858ab0.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/329e918b55847.pdfIn PDF document text
    • https://rugotegejobaxus.weebly.com/uploads/1/3/4/7/134734811/vewoledakabaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f9ca26fa4011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 5344 bytes
SHA-256: 9efab0b77a56accba019bdf3b5dc53bdc1c43c60c36a250b04cfa2d93413b485
font_01_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 10192 bytes
SHA-256: d4269bd29b1ab6c0da2d31d22c0bba6a5080492c4ab958b70151f236511b45a3

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