Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e17093ebcbb1fdf…

MALICIOUS

PDF

72.1 KB Created: 2021-01-04 19:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 79aa28f695c07ac5951b727cdc960522 SHA-1: 800cd8a4bdca897df3df4eb8b2b93737dfc9a119 SHA-256: 3e17093ebcbb1fdf3debb50cdae9b45ddda21c76b402171300ba2b188344b3f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution mechanism. One of the primary external links, 'https://trafffi.ru/aws?utm_term=qaseeda+burda+sharif+mp4', is flagged as unknown reputation, indicating a potential malicious destination. The PDF structure and the presence of numerous links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • 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?utm_term=qaseeda+burda+sharif+mp4 PDF link annotation
    • https://zedunuburow.weebly.com/uploads/1/3/4/0/134042823/bizudabad.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/11aa44768f.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/sapexotuzujefof.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/zupenafud/converse_plataforma_cuero_altas.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/roomba_manual_805.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/montgomery_ward_5_hp_tiller_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/bhai_marathi_movie_worldfree4u.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/telirejexadu.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/wegegas.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/99294692099.pdfIn PDF document text
    • https://s3.amazonaws.com/popagexexoza/awesome_mix_vol_2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/18138370514.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/new_york_jets_injury_report_week_14.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/canciones_de_guitarra_para_principiantes.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f1af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1AF 20284 bytes
SHA-256: 46a13d05c08f8cb27846d41367809bbf49b6f17508fb83a2259256f67846b629
font_00_sfnt_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 5540 bytes
SHA-256: 5f7e75225ace15961c3bf4a7b9540d51d0a9b89374aa37606bad2d6901932982
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 10700 bytes
SHA-256: 3714f34c038b30cd82afb5ad4dfbfdc83522aa1c6d83521e29bed57da97cca01

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