Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bafddcd216426b5…

MALICIOUS

PDF

68.5 KB Created: 2021-04-05 02:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 877217eae2883e5b3e6658819c60ed2f SHA-1: b0d41218c9e7339892a2ccc6ea5c64b3d9701e20 SHA-256: 7bafddcd216426b5ce218a95cb9040f34b94d63500939c134be4f3269d5ad112
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing attempt. One critical heuristic identified a link to a known malicious redirector, and ClamAV detected the file as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=service+bayliner+175 In PDF document text
    • https://cdn.sqhk.co/xonudutixova/fhegdih/mini_dash_griddle.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/9hf9hgv/disco_ducks_game_music.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/fezixatez.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/cjaihu9/50911686092.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/hhjja6X/youtube_video_downloader_chrome_mobile.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/63359137106.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/f7905d.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/jg74hhj/scanmaster_for_elm327_obd2_scantool_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604d5b5f1afd2.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/zufewomuzipilutusez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ff02df99cba9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/99664754393.pdfIn PDF document text
    • http://vunonam.atwebpages.com/78676635986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd807827-7b7c-4452-9482-fccd5a517fa0/tofunotinibawese.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/total_gym_pro_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/what_is_loki_norse_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55da1da-6a18-4a97-a9af-ff1c99bace3d/sokovigojowunudivelupul.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_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 5276 bytes
SHA-256: 63e73697deae8a879fbfd4bb6b212dea1f7606b997be27cb9cc68b9ed040ba96
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 12216 bytes
SHA-256: 4ddb233be5dc9bd07c1802c1bd2ae52b57a13944e88a25c73f6b2b0fd2c2d827

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