Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda4fa741a788f10…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 03:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6b6bb86c2a12fbbf7f9c4378ba46dd01 SHA-1: 27bd01e4ed757a642a61f4d66e78e1765e26032b SHA-256: fda4fa741a788f1071cd5724a877dc6fb07419edbee2afbc9752ebe41d13a84d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent link pointing to 'baarspo.ru'. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The embedded URL and the nature of the heuristic suggest this PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=mesa+and+scarp+terrain+are+a+result+of+differential+erosion PDF link annotation
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/3203532.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/zanodeje.pdfIn PDF document text
    • https://bagesasadav.weebly.com/uploads/1/3/4/3/134383367/4632147.pdfIn PDF document text
    • https://pimalikatirowo.weebly.com/uploads/1/3/4/0/134040386/933466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_6006b40ba2d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_6035347407d66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fcf62c7bb6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_60324958e134b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_5fe621aa26cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_601285574338f.pdfIn PDF document text
    • https://cdn.sqhk.co/mixirulizab/hfjjcjC/zulamowuxixaza.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/dozuga/79562974708.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/aula_internacional_1_podrcznik_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/soxotis.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/18389734154.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/battleship_game_free_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/christmas_giving_tree_tag_template.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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 5156 bytes
SHA-256: ee306f05d1d0613d3576f10817104b895ffa6f3cc9c8a15a42d7c59abdcf691d
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 11232 bytes
SHA-256: 6a5ec27f97e6b6b7fc62e3c9e0ab01cee46a1d44c934b1db4f3255925fc93493

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