Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5285898509ee4e6…

MALICIOUS

PDF

65.9 KB Created: 2020-11-11 11:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 31e0020aa99745fff6c2ecc3998d09f3 SHA-1: 6dd97c0c22007ae08130ff220f8cc9721350a544 SHA-256: e5285898509ee4e6307c10129df3454bb275cf5000c313d3c135e1b3be368ce4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://ggtraff.ru/strik?keyword=language+arts+words+that+start+with+a In PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/fukugepixix-mebamizobexo.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/11eb24ba86b.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/dabekako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f9c5fe3e3148.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/3464558.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/tipakalif/hay_day_hack_apk_download_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/zebolevuzipazinefanukegin.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/how_to_activate_prior_knowledge_in_science.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/tawugedu.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/bricks_beads_and_bones.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/dafalupigameroxe.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/20965539161.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/treatise_on_invertebrate_paleontology_brachiopoda.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_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 5088 bytes
SHA-256: 43e15f6718da4415f1003eed71a1f07f39c5f560d8f1b90981e640dba1781af4
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 9860 bytes
SHA-256: f631c1793702e59659e7f278678612953d08ae2d2f78c4e2354dfe4153ee9d8b

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