Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6adc4ebbb2b3c91…

MALICIOUS

PDF

59.3 KB Created: 2020-11-25 04:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16fb25bece409fa52dec807f427db502 SHA-1: d14636365082589a65bb5c8f910f57824a3acf35 SHA-256: f6adc4ebbb2b3c914466128c3a5af65c1d57153ec0999fe164487fe0ad211872
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several heuristics identifying it as a link farm and a redirector to malicious infrastructure. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=who+rule+the+world+gif
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fa73a8be8bff.pdf
    • https://cdn-cms.f-static.net/uploads/4466996/normal_5fbd826c74733.pdf
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fb846f49b2ba.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/vunobemopibunos.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_5fb03006ec1d9.pdf
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5fb38e6b99617.pdf
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/xuvukesav-tunel-peritovive.pdf
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f88a705cce0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/311e6ed8-86f5-4f2e-a057-36698ca5b74b/diary_of_an_oxygen_thief_tuebl.pdf
    • https://uploads.strikinglycdn.com/files/ba163a99-3ed2-4f1b-9b58-77e85af2ca0a/rerukamodanu.pdf
    • https://uploads.strikinglycdn.com/files/ca304969-3cef-4a20-be6e-0d2ab2a3b241/gauss-seidel_matlab_code.pdf
    • https://uploads.strikinglycdn.com/files/da4c489f-4a8b-4271-811f-94ca462639da/intervalos_ejercicios_4_eso.pdf
    • https://uploads.strikinglycdn.com/files/36a4c05a-f6da-4249-847e-953ab7ec5fc5/cset_multiple_subject_subtest_2_study_guide.pdf
    • https://s3.amazonaws.com/benuka/adventure_games_apk_file.pdf
    • https://s3.amazonaws.com/goneduzum/mijixavoxajola.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae01.bin
79346f278b310d89fc727983f3601ed86a88dfc2866db32cfbf797611a2c5b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 4884 bytes
font_01_sfnt_off0000beb3.bin
dccc7f051936ba6647a6808a68c67cb5cbb8bb2869d5fdeeda4183d1134209a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB3 9944 bytes

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