Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41e8bb100de1866…

MALICIOUS

PDF

75.4 KB Created: 2021-03-09 08:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a3ef69b00425ca07bc5654609426712 SHA-1: a33d5805862eb5d2b889a47e3045378af6007ff1 SHA-256: e41e8bb100de1866b4efd6cf08f5368703e24a9e791dd657bc2dddd1019b736f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to other PDF files. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links. No scripts were extracted, but the presence of many external links suggests a potential for further exploitation or phishing.

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://resalured.ru/wix?keyword=think+big+act+small+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5fdc029e541f0.pdfIn PDF document text
    • https://mivixotagu.weebly.com/uploads/1/3/1/3/131384173/2802133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_6035405cb9650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_601b504cbc692.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/jaijc4C/odd_eyes_raging_dragon_wallpaper.pdfIn PDF document text
    • http://mists.space/76205069727nnkdu.pdfIn PDF document text
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/32e91fa22d5d5e.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/3Hhadhd/vajabufawolinarexim.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/66317c2f283.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/05ac9cdef6.pdfIn PDF document text
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/vuzevisazumil.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/VMiePCW/65004036405.pdfIn PDF document text
    • https://xubinidofomazi.weebly.com/uploads/1/3/4/5/134576331/8580cc1c618eb.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/819a13.pdfIn PDF document text
    • https://lovevupadu.weebly.com/uploads/1/3/5/3/135328586/vadejutosesexut-dafujirotakofim-xizabev-xikapenaril.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/buvizexile.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/326bb415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5fd75d63002ef.pdfIn PDF document text
    • http://healingtunes.ru/dokaposi39oug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_d4b06696f61f47c7a7b5ae5a7144ced8.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_0bdcd69d87384dfea9014f23d7eb85f7.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_b09d026f5c8344cc91bcfd987b2af507.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5628 bytes
SHA-256: 8a01a4f7632aefc7dda2017b43d8828b1c8c9ed4290f8aa2b88b8b70e10b91bd
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10736 bytes
SHA-256: 9ab7e495267f7b3403b779a86eb635471d1e9b77c5e9cce27e730bf33608b14c