Malicious PDF — malware analysis report

Static analysis result for SHA-256 330927361aa2064f…

MALICIOUS

PDF

63.5 KB Created: 2021-02-21 19:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab642410e0785d812bf84236def18e17 SHA-1: 51571baada6fab7882bbb98259a26ff12262383f SHA-256: 330927361aa2064fc5fcc10464c6e48d373a094baf87c9e7ecf2e0eb0cf5b29f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search results or distribute content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or content-distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=nordictrack+exp+1000+xi+troubleshooting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_601f05e8ac54d.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/g3kijwZ/xubufigobupewab.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/xutifume_jajapalojaraje_pukodigovu.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/9heNJL2/dr._sung_kong_dds.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jiNCMUT/wiketude.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/qhgigKr/spin_the_wheel_numbers_1-_50.pdfIn PDF document text
    • https://cdn.sqhk.co/sanozusu/VdwhIBr/nojemimubexegovamamomom.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/aUggecX/elifoot_19_20_pro_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd316039995b.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/jikasitejo-sonotominefobep-jusuraluwugisaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/4hjigjh/48475524964.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/wugaduzabap-vufopimawot-pizetixazoja-makidazegubog.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/wiremeresegikon/haunting_ground_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/andy_for_windows_xp_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/glenshee_mountain_snow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/natizaf.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/13010631672.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_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 5772 bytes
SHA-256: a2d926998263f89a7ae4f4b4dcc08b7745e0a2f08e9dc491506e285a06423e26
font_01_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 9380 bytes
SHA-256: 20b6ce6a120802d5127baf8c23057d71d53932bcb7d25fa21d3c454c1de57de9

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