Malicious PDF — malware analysis report

Static analysis result for SHA-256 998341ca135692bc…

MALICIOUS

PDF

166.1 KB Created: 2021-03-11 10:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3fcee84ec0a899dc12fb9e5f0b60f5fc SHA-1: e1d88293a795d3b2b3baa1cb0591385ce1994c85 SHA-256: 998341ca135692bcdc0bc62c4ae10ea167ed6bf30c9bdfbe7747fb2b18a6792d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery via the external URLs. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/award?keyword=barron+s+essential+words+for+ielts+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412890/normal_5ff2bda8e9339.pdfIn PDF document text
    • https://cdn.sqhk.co/donaxewon/RjbGOjf/3263535040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6042c44b720c8.pdfIn PDF document text
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/9fa1a6fcebb68b.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/tatifasubofagot_zusoj_konipekereraro_vizubogedovo.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/0O9YVYd/lanamilepovarap.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/60642265272.pdfIn PDF document text
    • https://dezuvamugofa.weebly.com/uploads/1/3/4/1/134131805/budejo.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/3180530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe1661aa068a.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/sheYojg/metal_boy_dog_names_unique.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_601f25be13313.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/37449821712.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/fjjCu4W/mad_skills_motocross_2_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zewapoxi/jOT5wd6/10217671249.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/S4ianie/53319729048.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/hjicg61/dream_club_soccer.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/EgjgcrR/yes_that_dress_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_60204f4293836.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/16171005243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_56a6a9eeb35b4c43b4fe619039110afc.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_2d2e8fc3381642a6a4252292dac8675e.pdf?index=trueIn PDF document text
    • http://zimopup.myartsonline.com/wordpress_themes_for_authors_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C8D 5380 bytes
SHA-256: 93554b17d3ffb82b1f8bf460209bdec677f8b6b9b0068046eff93e362a373759
font_01_sfnt_off00024efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EFA 10912 bytes
SHA-256: 90b075c32c17daf31734559efd43bb0b424cef731b82745404db80e4a2b5a6e9
font_02_sfnt_off00027440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27440 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e