Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1659c1dc0ecff7c…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 10:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ed5e4d3b64177533044927645ccfab6 SHA-1: 30f7c5e2a91e3d835e56889b2c803ebb11005096 SHA-256: c1659c1dc0ecff7cbeffb1be85a8ab1802db4e0e68091dd31e62d896fdb6240b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely hosts malicious content. It contains numerous embedded URLs pointing to external sites, with at least one identified as a known malicious redirector. The presence of these links suggests the primary purpose is to redirect users to potentially harmful websites, possibly for phishing or to download further malware. No scripts were extracted, but the PDF structure and embedded links are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=gladiator+heroes+mod+apk+3.4.5 In PDF document text
    • http://zipubezexupoka.mywebcommunity.org/what_is_process_description_in_technical_writing.pdfIn PDF document text
    • http://businessmentality.com/por_el_placer_de_vivir_con_csar_lozcl5ei.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/xudirofajubona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_6036bca566020.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/8f2ebbf6c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff5e21ecb667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_6015d8e2541a2.pdfIn PDF document text
    • https://sesuxaned.weebly.com/uploads/1/3/5/3/135349378/4702148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_601f166ae7c96.pdfIn PDF document text
    • http://egrn-order.online/peoplesoft_absence_management_training_guidep0ygj.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/6725004.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/9881597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fe44ff136f49.pdfIn PDF document text
    • http://lasleymarkt.ru/masixazoxilckzyl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5ffd462749402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382770/normal_5fce3605a8df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_603726bec29c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivuzujanux.myartsonline.com/mircea_eliade_mito_y_realidad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5700 bytes
SHA-256: a74bdab0b958fcb44609ef345e98b8a7f609523e64aef05527b0fde1b23f579d
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 3112 bytes
SHA-256: 84cf1c40d1d791f2fd1eee01c1a1c357d706162e1313232d328164a38df56265
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10584 bytes
SHA-256: 96adc9e525f2de49aaab8a549c915b06320239bc9f50cc23062454449d8e6f37
font_03_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940