PDF malware analysis — malicious · c739b12e9a29148f

MALICIOUS

PDF

73.9 KB Created: 2021-04-05 11:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d3d8eac1774300ae6f16c75edfc10b21 SHA-1: ae7fcf2e98a94f314bdc5c54bb4627da1cf9b955 SHA-256: c739b12e9a29148f7ecba982f77cc58ecdf2f865a85fe3ea6531c6ef0219d5d1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'dafemum.ru', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'Canada food guide' and 'wkhtmltopdf', suggesting a lure to disguise the malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://dafemum.ru/123?utm_term=canada+food+guide+grains+serving+size
- https://cdn-cms.f-static.net/uploads/4462374/normal_60257cc6b23f5.pdf
- https://cdn-cms.f-static.net/uploads/4477873/normal_5fd3aacb7b69b.pdf
- http://power-guard.shop/366007268533ajmf.pdf
- https://cdn-cms.f-static.net/uploads/4380523/normal_6069e3dbed08c.pdf
- https://cdn-cms.f-static.net/uploads/4409107/normal_600ba8597c777.pdf
- https://cdn-cms.f-static.net/uploads/4370762/normal_60571a0adeaec.pdf
- https://cdn-cms.f-static.net/uploads/4370746/normal_605ba492815e8.pdf
- https://cdn-cms.f-static.net/uploads/4402504/normal_6045153ad1788.pdf
- https://static.s123-cdn-static.com/uploads/4392649/normal_5fcc0d269bbff.pdf
- http://opensalon.xyz/alison_bechdel_dykes_to_watch_out_for_bechdel_test8dunm.pdf
- https://cdn-cms.f-static.net/uploads/4419818/normal_6018bac3c1718.pdf
- https://cdn-cms.f-static.net/uploads/4473651/normal_605978f8392af.pdf
- https://static.s123-cdn-static.com/uploads/4453134/normal_5fcd29cf65adf.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/robumuduluwise/23888027755.pdf
- https://s3.amazonaws.com/wejuvono/asics_women_s_clothing_size_guide.pdf
- https://s3.amazonaws.com/saxefi/55917158178.pdf
- https://s3.amazonaws.com/tezude/ejercicios_de_escritura_tercer_grado_primaria.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e419.bin` `46fb500f4e39cc60ca9f5586a646b92a92f456cecbcbbe9e74a963283cce3ee4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE419	5056 bytes
`font_01_sfnt_off0000f56e.bin` `e5e807f711569280570807be273e6721dd4cf3466834e8e4ba66141d98105366`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF56E	10712 bytes

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