Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a27f1086c894327…

MALICIOUS

PDF

81.6 KB Created: 2021-01-18 17:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb0fd48664f214fc432d1f99a43721b2 SHA-1: d00a5027e615933a7d3f87ffb81003b8f7464348 SHA-256: 8a27f1086c8943277c11bcca9995640ac62ee7dcd52e66bbac9da841c6488c4f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links and the redirector heuristic suggest the primary purpose is to lure users to malicious sites, likely as a phishing or malware distribution vector. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://traffking.ru/wb?keyword=talk%20radio%20movie%20streaming In PDF document text
    • https://site-1180945.mozfiles.com/files/1180945/missing_persons_band_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fcaf08a95f70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5fe2351bb85a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5feec2616ea92.pdfIn PDF document text
    • https://site-1168315.mozfiles.com/files/1168315/rovogezofutefaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5fa6c1bf1549d.pdfIn PDF document text
    • https://site-1244706.mozfiles.com/files/1244706/baixar_jogo_de_tiro_para_android.pdfIn PDF document text
    • https://site-1171526.mozfiles.com/files/1171526/girl_squad_bff_in_style.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5f9e27b260217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f9750c1b1ecf.pdfIn PDF document text
    • https://site-1195605.mozfiles.com/files/1195605/dragon_age_elves_names.pdfIn PDF document text
    • https://site-1166701.mozfiles.com/files/1166701/43534729128.pdfIn PDF document text
    • https://site-1172568.mozfiles.com/files/1172568/kotulebawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f8f3e2fb2670.pdfIn PDF document text
    • https://site-1172039.mozfiles.com/files/1172039/62638529882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fb89b9744258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fusidejebi/81803928596.pdfIn PDF document text
    • http://jinibodakix.epizy.com/84755657185.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/nogemadaminilibewatazuwe.pdfIn PDF document text
    • http://vopapatadape.epizy.com/baxizeseliti.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/agrochemical_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/tatomavigixegesir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 5004 bytes
SHA-256: b493306f632b7eeaffb2cd55a67f47b1c57134acbd9c672548fa6969c392df7b
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10684 bytes
SHA-256: 6e44c46e6a8c2bd797247dcbc0cf60cba18d64a515fedcc8d006e376df4390ad
font_02_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60