Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e325a13dc354fa…

MALICIOUS

PDF

66.3 KB Created: 2020-11-18 05:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0db87589cff205a4ec652432f214468a SHA-1: 1e618e6a0c0f47a9c0ada3182a6bb5e68574fb19 SHA-256: 82e325a13dc354fae5b2cc7c3b4a1ced2e744f9f61cb78f6a886477b3b8c6dd7
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded links that redirect to known malicious infrastructure, specifically identified as a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or spam distribution. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to obscure the malicious destination.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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://ggtraff.ru/strik?utm_term=free++linux+backtrack+5 In PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/fovizoluxu.pdfIn PDF document text
    • https://dalulasu.weebly.com/uploads/1/3/4/4/134493325/fba50738ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f8c12e1f0d64.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/2afd7cbb-33a7-43cb-9803-962e1fb1badd/vidiwaku.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/how_did_frankie_vallis_stepdaughter_die.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1374fbc4-de71-4be1-a3b9-d27af850954e/16911169801.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/kakijupowesudijitomigaxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5699c7-15d3-40b6-b14c-47fbfe23fcad/dead_zone_dbz_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b92cff4-2ddc-465c-a27e-e93cba30dfc0/kivuraresopizutetub.pdfIn PDF document text
    • https://s3.amazonaws.com/kugufitel/bang_chung_thep_3_tap_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dae02c8-2a8e-402d-bae1-b2e8abdde2dc/bioreactor_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4b75eb-7a4f-4755-a5c4-ae6764523939/moa_vs_milrad_scopes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 4968 bytes
SHA-256: 1d3ca5bf56e200868323b3922967da7041cf9c9b440f5fe636b60f85f391198d
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10808 bytes
SHA-256: 8c69644b7df447575c2ba7d4061a32c47e01c0ddbd92e10d9664799be41ec94c

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