Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa4d7735782dce…

MALICIOUS

PDF

71.2 KB Created: 2020-11-22 11:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65e16b7f61b57d5f0323e2c08af33d3 SHA-1: 16f5cd4f04bdf3f6b098280f330a82ceed0ca22a SHA-256: ecaa4d7735782dceeac4aa6cae187d6958c79788b3d79f1c4fca3a27a664e33c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'traffnew.ru', flagged as a potential phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=physical+science+book+pdf
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/lazupu.pdf
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/tofadevesemukek_gasogopel_tipozaxiwu.pdf
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/ribinukuwuneze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/197a1372-c38c-4f53-9a94-4fa075909a06/quiste_de_ovario_gpc.pdf
    • https://s3.amazonaws.com/penale/suwofatexelopo.pdf
    • https://uploads.strikinglycdn.com/files/7842984f-0fe0-4708-9f09-b08934a6468e/paxolusadefenilutaza.pdf
    • https://uploads.strikinglycdn.com/files/5b37a7ac-3825-4331-9c01-adef1e7aa790/pewumisidegisu.pdf
    • https://s3.amazonaws.com/luborinizu/north_coastal_plains_major_cities.pdf
    • https://uploads.strikinglycdn.com/files/a0b5581a-0e6f-42c9-9d59-2073a4157492/72577164557.pdf
    • https://s3.amazonaws.com/suxuzubojut/47975213774.pdf
    • https://uploads.strikinglycdn.com/files/465c31a5-7f93-4fab-9cd4-61da084d938a/applebees_pay_stubs.pdf
    • https://uploads.strikinglycdn.com/files/04146a54-4350-4912-8cf5-e18f00a1b57c/48328660447.pdf
    • https://uploads.strikinglycdn.com/files/bb5d2c20-73fd-4478-9097-b9114766a7bd/51124621827.pdf
    • https://uploads.strikinglycdn.com/files/360cd632-d0af-4ccc-9938-3c3e2688491c/back_exercises_machine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe2.bin
739984dd7e9d53e3cecb4301f8c48c8fcef260b7727bf6b5f8d2f28d542305b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 5164 bytes
font_01_sfnt_off0000dd52.bin
19c926f8ebdd87d0a9a366e21ecab6629dbd7c0c5e57d1e50e0b87c5fdfdd731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10860 bytes
font_02_sfnt_off00010227.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 4324 bytes

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