Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45c7eef34018372…

MALICIOUS

PDF

39.3 KB Created: 2020-11-06 12:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 626777f4a8f5486823f8e19239c67d18 SHA-1: 08e08ae94987e32226689850e1b51278596d6bff SHA-256: f45c7eef34018372253290a6e25f713908ab8484cc9170c0b0021918f7309b56
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are generated in a link farm pattern, suggesting a SEO poisoning or redirection attempt. The document body, though heavily obfuscated, contains URLs that are likely intended to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffi.ru/aws?keyword=glencoe+physical+science+answer+key+pdf PDF link annotation
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f906232cd7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f93345d70c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5f90a6ba196bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f874f3129c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f89c4f8b0046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8943be00f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fa529d19e843.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/nepogum-fubenazemi-rokete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5fa0402e2aa01.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/mavixu/legit_hacks_for_free_amazon_gift_card_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5845/2897/files/53463047615.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_off0000428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x428E 5532 bytes
SHA-256: cadf1169324c88a926c25c883c2109b6f982ed44dbc80399442a28524f3aed35
font_01_sfnt_off00005575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5575 9516 bytes
SHA-256: f213ef41fdc1caf22c2dc89ef2ae129600c2c65e41de68e8c8cf2ed37493882a
font_02_sfnt_off00007639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 17532 bytes
SHA-256: 2cc614f38d6dd3a017889ddd7dde381734262f382ef4246dd539d8933d67bbec

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